Fix bug where RSS feeds got lost when a fetching error occured

Closes #871

See merge request !583

Make debug builds installable alongside official beta build

See merge request !582

Throw checked exceptions for camera errors

See merge request !580

Always play a notification sound, if at least 2sec after last one

Closes #994

See merge request !581

This is the same behavior as Signal.
We might want to adjust the delay later on.

This is also introduces a new BriarNotificationBuilder as a first step
to clean up the Notification Manager code.

Catch RuntimeException when getting camera parameters

See merge request !579

Catch IllegalArgumentException when decoding QrCode

Closes #1008

See merge request !578

Prevent NPE in CameraView

Closes #1009 and #997

See merge request !577

Closes #997

This prevents crashes, but still might cause the camera to not show up
thus preventing the user from adding contacts.

Update translations, add Turkish and Russian

See merge request !575

Runtime error fix due to window requests

Closes #1016 and #1007

See merge request !576

Prevent a crash caused by empty emoji

Closes #1015

See merge request !571

The crash happens because the serialization of recently used emoji uses
';' to separate the emojis.
One of the ASCII emojis however has a ';' in the beginning.
When this one is used by the user,
it causes an empty string to be returned when deserializing.

This commit prevents the crash by changing the separator to a tab.
It uses a different settings string to store the emoji,
so users will lose the list of recently used emoji when they update to
this version.

PS. That wasn't my idea ;)

Enable logging for beta builds

See merge request !573

Prevent crash in blog by ensuring a listener always exists

Closes #1006

See merge request !574

Close InputStream from RSS feed and prevent NPE

See merge request !572

Some devices were logging and others not, due to the log level being set in the SplashScreenActivity constructor.

Show blog posts with full text when clicked

Closes #993

See merge request !570

This fixes a regression that was introduced in !551.

Fix "shared with" counter not being updated

Closes #955

See merge request !569