Add constant-time method for verifying MACs

See merge request akwizgran/briar!773

Make test data creation configurable.

Closes #1149

See merge request akwizgran/briar!771

Create a valid BT MAC and UUID when creating testdata

See merge request akwizgran/briar!769

Helper methods for dealing with TransportProperties

See merge request akwizgran/briar!768

Add download button to ExpiredActivity

See merge request akwizgran/briar!766

Helper method for parsing transport properties

See merge request akwizgran/briar!764

Generate message and group IDs in a forward-compatible way

See merge request akwizgran/briar!763

Don't download Tor binaries if they already exist

See merge request akwizgran/briar!760

Set max length for client IDs

See merge request akwizgran/briar!762

Merge add/remove contact hooks

See merge request akwizgran/briar!761

Support multiple sets of transport keys per contact

See merge request akwizgran/briar!745

Don't reset Tor connectivity state unless we lose connectivity

Closes #1180

See merge request akwizgran/briar!756

Enable LAN plugin when providing a wifi access point

Closes #1171

See merge request akwizgran/briar!752

Shut down cleanly when phone is shutting down or memory is low

Closes #1190

See merge request akwizgran/briar!742