Switch back to JSON for Flatpak manifest

Although I find YAML a lot better, GNOME Builder sadly doesn't support
it: https://gitlab.gnome.org/GNOME/gnome-builder/issues/520

This essentially reverts 5fc6b517, but
also updates some dependencies.

app.briar.gtk.json

+{
+    "app-id": "app.briar.gtk",
+    "runtime": "org.gnome.Platform",
+    "runtime-version": "3.32",
+    "sdk": "org.gnome.Sdk",
+    "sdk-extensions": [
+        "org.freedesktop.Sdk.Extension.openjdk11"
+    ],
+    "command": "briar-gtk",
+    "finish-args": [
+        "--share=network",
+        "--share=ipc",
+        "--socket=x11",
+        "--socket=wayland",
+        "--filesystem=xdg-run/dconf",
+        "--filesystem=~/.config/dconf:ro",
+        "--filesystem=~/.briar",
+        "--talk-name=ca.desrt.dconf",
+        "--env=DCONF_USER_CONFIG_DIR=.config/dconf",
+        "--env=PATH=/app/bin:/usr/bin:/app/jre/bin"
+    ],
+    "build-options": {
+        "cflags": "-O2 -g",
+        "cxxflags": "-O2 -g",
+        "env": {
+            "V": "1"
+        }
+    },
+    "cleanup": [
+        "/include",
+        "/lib/pkgconfig",
+        "/man",
+        "/share/doc",
+        "/share/gtk-doc",
+        "/share/man",
+        "/share/pkgconfig",
+        "*.la",
+        "*.a"
+    ],
+    "modules": [
+        {
+            "name": "openjdk",
+            "buildsystem": "simple",
+            "build-commands": [
+                "/usr/lib/sdk/openjdk11/install.sh"
+            ]
+        },
+        {
+            "name": "python-dependencies",
+            "buildsystem": "simple",
+            "build-commands": [
+                "pip3 install --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} requests2 websockets"
+            ],
+            "sources": [
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/18/b0/8146a4f8dd402f60744fa380bc73ca47303cccf8b9190fd16a827281eac2/certifi-2019.9.11-py2.py3-none-any.whl",
+                    "sha256": "fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
+                },
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/24/53/f397db567de0aa0e81b211d81c13c41a779f14893e42189cf5bdb97611b2/urllib3-1.21.1-py2.py3-none-any.whl",
+                    "sha256": "8ed6d5c1ff9d6ba84677310060d6a3a78ca3072ce0684cb3c645023009c114b1"
+                },
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/bc/a9/01ffebfb562e4274b6487b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl",
+                    "sha256": "fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+                },
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/89/f0/7cd1a25af31a5d4971d2eac794b0bc31eb445b28cadd621d4ad04be5ae4c/requests2-2.16.0-py2.py3-none-any.whl",
+                    "sha256": "141d4f8ad6c1b68932d54f71f303c2aef681556b519c490ec83da193761a9f91"
+                },
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/11/7d/9bbbd7bb35f34b0169542487d2a8859e44306bb2e6a4455d491800a5621f/idna-2.5-py2.py3-none-any.whl",
+                    "sha256": "cc19709fd6d0cbfed39ea875d29ba6d4e22c0cebc510a76d6302a28385e8bb70"
+                },
+                {
+                    "type": "file",
+                    "url": "https://files.pythonhosted.org/packages/79/78/17e97a159dc55308b1468a638c7267f19765281f6205ec9c15253c154022/websockets-8.0.2.tar.gz",
+                    "sha256": "882a7266fa867a2ebb2c0baaa0f9159cabf131cf18c1b4270d79ad42f9208dc5"
+                }
+            ]
+        },
+        {
+            "name": "briar-headless",
+            "buildsystem": "simple",
+            "build-commands": [
+                "mkdir -p /app/briar",
+                "install -Dm644 briar-headless.jar /app/briar/briar-headless.jar"
+            ],
+            "sources": [
+                {
+                    "type": "file",
+                    "url": "https://media.dorfbrunnen.eu/briar/jars/004/briar-headless.jar",
+                    "sha256": "e9dd86756ef42267b7e51a2ae3534a4666748570aa9acdff1e77bc4cdf5742cc"
+                }
+            ]
+        },
+        {
+            "name": "briar-gtk",
+            "buildsystem": "meson",
+            "config-opts": [
+                "--libdir=lib"
+            ],
+            "builddir": true,
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://code.briarproject.org/nicoalt/briar-gtk.git"
+                }
+            ]
+        }
+    ]
+}

app.briar.gtk.yaml

-# Copyright (c) 2019 Nico Alt
-# SPDX-License-Identifier: AGPL-3.0-only
-# License-Filename: LICENSE.md
-
-app-id: app.briar.gtk
-runtime: org.gnome.Platform
-runtime-version: '3.32'
-sdk: org.gnome.Sdk
-sdk-extensions:
-- org.freedesktop.Sdk.Extension.openjdk11
-command: briar-gtk
-finish-args:
-- --share=network
-- --share=ipc
-- --socket=x11
-- --socket=wayland
-- --filesystem=xdg-run/dconf
-- --filesystem=~/.config/dconf:ro
-- --filesystem=~/.briar
-- --talk-name=ca.desrt.dconf
-- --env=DCONF_USER_CONFIG_DIR=.config/dconf
-- --env=PATH=/app/bin:/usr/bin:/app/jre/bin
-build-options:
-  cflags: -O2 -g
-  cxxflags: -O2 -g
-  env:
-    V: 1
-cleanup:
-- /include
-- /lib/pkgconfig
-- /man
-- /share/doc
-- /share/gtk-doc
-- /share/man
-- /share/pkgconfig
-- "*.la"
-- "*.a"
-modules:
-- name: openjdk
-  buildsystem: simple
-  build-commands:
-  - /usr/lib/sdk/openjdk11/install.sh
-- name: python-dependencies
-  buildsystem: simple
-  build-commands:
-  - pip3 install --no-index --find-links="file://${PWD}" --prefix=${FLATPAK_DEST}
-    requests2 websockets
-  sources:
-  - type: file
-    url: https://files.pythonhosted.org/packages/06/b8/d1ea38513c22e8c906275d135818fee16ad8495985956a9b7e2bb21942a1/certifi-2019.3.9.tar.gz
-    sha256: b26104d6835d1f5e49452a26eb2ff87fe7090b89dfcaee5ea2212697e1e1d7ae
-  - type: file
-    url: https://files.pythonhosted.org/packages/96/d9/40e4e515d3e17ed0adbbde1078e8518f8c4e3628496b56eb8f026a02b9e4/urllib3-1.21.1.tar.gz
-    sha256: b14486978518ca0901a76ba973d7821047409d7f726f22156b24e83fd71382a5
-  - type: file
-    url: https://files.pythonhosted.org/packages/d8/82/28a51052215014efc07feac7330ed758702fc0581347098a81699b5281cb/idna-2.5.tar.gz
-    sha256: 3cb5ce08046c4e3a560fc02f138d0ac63e00f8ce5901a56b32ec8b7994082aab
-  - type: file
-    url: https://files.pythonhosted.org/packages/fc/bb/a5768c230f9ddb03acc9ef3f0d4a3cf93462473795d18e9535498c8f929d/chardet-3.0.4.tar.gz
-    sha256: 84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae
-  - type: file
-    url: https://files.pythonhosted.org/packages/09/0f/9dacaa075f8e46d463248c28dbb9770445d2e04cca5c4aa23d431c9ba861/requests2-2.16.0.tar.gz
-    sha256: f7685b2d620a172053cced288dddf12d4b3441a382cc382821c0f36c02488516
-  - type: file
-    url: https://files.pythonhosted.org/packages/ba/60/59844a5cef2428cb752bd4f446b72095b1edee404a58c27e87cd12a141e2/websockets-7.0.tar.gz
-    sha256: 08e3c3e0535befa4f0c4443824496c03ecc25062debbcf895874f8a0b4c97c9f
-- name: briar-headless
-  buildsystem: simple
-  build-commands:
-  - mkdir -p /app/briar
-  - install -Dm644 briar-headless.jar /app/briar/briar-headless.jar
-  sources:
-  - type: file
-    url: https://media.dorfbrunnen.eu/briar/jars/003/briar-headless.jar
-    sha256: aa93cfd27b3e7e9b8e3c7e40666d6fa76fd83139a82cbef04cf334a93c369503
-- name: briar-gtk
-  buildsystem: meson
-  config-opts:
-  - --libdir=lib
-  builddir: true
-  sources:
-  - type: git
-    url: https://code.briarproject.org/NicoAlt/briar-gtk.git
-