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Refactor Tor settings and add a setting for forcing the use bridges

Closes #1269

See merge request briar/briar!895

Use /dev/urandom for CI

See merge request briar/briar!899

Screen Lock: Lock after customizable inactivity timeout

See merge request briar/briar!887

New Design for Message Bubbles

Closes #1358

See merge request briar/briar!896

This reverts commit f8a8c0d8.

Move gradle witness dependency verification into dedicated files

See merge request briar/briar!892

This also adds a script for makes upgrading dependency checksums so much easier

Replace CheckBoxPreference with the more standard SwitchPreference

See merge request briar/briar!891

# Conflicts:
#   briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java

Screen Lock Feature

See merge request briar/briar!870

Also automatically unlock if device screenlock was removed.

Remove unused constants

See merge request briar/briar!889

Make back-facing camera optional in manifest

See merge request briar/briar!888

This solution even works when "don't keep activities" is active

When the user removes the screen lock, the app does not get really
locked. There is no way about getting notified about this. Before users
lock the app without it getting actually locked, we rather remove the
button that was collapsed and not easy to find anyway.

This only shows the settings if a screen lock is available.
If the setting is activated, it shows a drawer item for locking.
Once locked, the screen lock secret needs to be entered to enter the
app again.

First part of #1247