Add proguard rules to keep logback/slf4j

Closes #182

See merge request !146

Target SDK 33 and upgrade some libs

See merge request !144

Add comment about NetworkInfo#isConnected()

See merge request !145

Clean up. Remove unused things, fix some minor issues

Closes #27

See merge request !141

Add StatusManager as eager singleton

Closes #163

See merge request !143

Fixes a problem where status updates would be be received and bubbled up
to the notification manager when the mailbox is started not via the UI
but autostarted from the system at boot.

Upgrade Tor to 0.4.7.13

See merge request !142

Improve text shown in startup screen

Closes #175

See merge request !140

* Add a headline "Starting Mailbox"
* Convert old texts to smaller status messages and make them less
  technical / more desriptive

Upgrade Tor to 0.4.7.12

See merge request !138

After wiping show different screen depending on local or remote wipe

Closes #156

See merge request !139

Add debug build type and enable minification

Closes #173

See merge request !137

When wiped locally, show the instructions to wipe from Briar again to
finish unlinking. When wiped remotely, don't show any instructions, just
the wipe completed message.

Improve stop button usability

Closes #178

See merge request !135

When tapping the stop button, a confirmation dialog gets shown. When
tapping the help button, an explainer dialog gets shown.

Add additional connectivity check to make NoNetwork screen appear earlier

Closes #121

See merge request !136

We no longer need this as we're displaying NoNetworkFragment anyway in
this case instead of a modified StatusFragment.

Add constants for QR code format ID and version

See merge request !134

Convert TextButtons to OutlineButtons except for dialogs

Closes #180

See merge request !133

Move stop button below description on status screen

Closes #177

See merge request !132

Remove semaphore in LIfecycleManagerImpl and special case for CLI in stopServices()

Closes #157

See merge request !130

No longer show time on notification

See merge request !131

Only one thread should now ever be able to reach the finally block of
stopServices(), hence no deadlock should be possible.