Watch for creation rather than updating of Tor cookie file

See merge request akwizgran/briar!825

Tor writes to a temporary file and then renames it over the old
file, if any, so CLOSE_WRITE never occurs. The old code was
working in most cases because it received IGNORED when the old
file was unlinked and didn't check the event type.

Add default build timestamp in case Git command fails

See merge request akwizgran/briar!826

Log exception stacktraces

Closes #1294

See merge request akwizgran/briar!824

Remove RemovableDrivePlugin, refactor plugin interface

Closes #25

See merge request akwizgran/briar!817

Disable reblog scene transition as it even crashes my Android 7.1 device

Closes #785

See merge request akwizgran/briar!821

Disable pre-fetching in Threaded RecyclerView as a workaround for #1289

See merge request akwizgran/briar!820

Closes #785

Remove debug logging from setup process

See merge request akwizgran/briar!819

Make plugins and polling configurable

See merge request akwizgran/briar!814

Download Tor binaries from JCenter

See merge request akwizgran/briar!816

* Move PluginConfig out of bramble-android. Projects using bramble now need to provide it.
* Add a PluginConfig#shouldPoll() method which can be used to disable polling altogether.
* Move Poller instantiation to the PluginManager.

Replace jtorctl jar with JCenter dependency

See merge request akwizgran/briar!815

Store database key in a file

Closes #1219

See merge request akwizgran/briar!810

Introduction: Reset session information for removed introducees

Closes #1281

See merge request akwizgran/briar!813

Escape Unicode characters in test data

See merge request akwizgran/briar!812

This enables reproducible builds with non-Unicode locales.

Make build timestamp command compatible with old versions of Git

See merge request akwizgran/briar!811

Switch to our own CI image

See merge request akwizgran/briar!809