Merge branch 'qr-link' into 'main'

...in/java/org/briarproject/mailbox/android/StatusManager.kt

.../java/org/briarproject/mailbox/android/ui/MainActivity.kt

...ava/org/briarproject/mailbox/android/ui/QrCodeFragment.kt

...org/briarproject/mailbox/android/ui/QrCodeLinkFragment.kt

mailbox-android/src/main/res/drawable/ic_content_copy.xml

mailbox-android/src/main/res/drawable/ic_share.xml

mailbox-android/src/main/res/layout-land/fragment_qr.xml

mailbox-android/src/main/res/layout/fragment_qr.xml

mailbox-android/src/main/res/layout/fragment_qr_link.xml

mailbox-android/src/main/res/menu/link_actions.xml

mailbox-android/src/main/res/navigation/nav_main.xml

mailbox-android/src/main/res/values-night/themes.xml

mailbox-android/src/main/res/values/strings.xml

mailbox-android/src/main/res/values/themes.xml

...ox-cli/src/main/java/org/briarproject/mailbox/cli/Main.kt

...java/org/briarproject/mailbox/core/setup/QrCodeEncoder.kt

...main/java/org/briarproject/mailbox/lib/AbstractMailbox.kt