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.

Revert logback and slf4j back to older versions

See merge request !129

Upgrade all outdated dependencies

Closes #18

See merge request !128

Use a fake TorPlugin for mailbox-lib tests

Closes #165

See merge request !125

Use a fake TorPlugin for mailbox-lib tests

See merge request !126

Make sure to update notifications always, not only when activity is started

Closes #163

See merge request !127

Replace illustrations with new ones

See merge request !124

to avoid bootstrapping a real tor instance when it isn't really needed as we access the mailbox directly on localhost

Upgrade libs

Closes #162

See merge request !123

Add lib module for using mailbox as a library, especially in briar integration tests

See merge request !115

Add parameter that can be used to instruct mailbox not to exit on stop

Closes #158

See merge request !121

Fix DoNotKillMeFragment from getting re-created preventing users from proceeding

See merge request !122

Otherwise, it gets recreated with the view model.

 The system state is updates async on Xiaomi devices, so we need to give it a bit of extra time before showing a dialog.

preventing users from proceeding

Let StatusManager combine all sources into single app state

Closes #122, #155, and #159

See merge request !119

This fixes a number of subtle issues that happen for example on screen
rotation or when the activity gets destroyed and recreated.

Make onboarding readable on small landscape screens

Closes #152

See merge request !120

Get rid of OnboardingActivity, use a fragment in MainActivity instead

Closes #144, #150, and #153

See merge request !117