1) Use the new /v2/keys API for storing/retrieving prekey bundles.
2) For sessions built with PreKeyBundle and PreKeyWhisperMessage,
use a v3 ratcheting session when available.
1) Move all the crypto classes from securesms.crypto.
2) Move all the crypto storage from securesms.database.keys
3) Replace the old imported BC code with spongycastle.
1) ABS is now published as an AAR, so we can eliminate all local
dependencies and bundled jars.
2) Upgrade to ABS 4.4.0 (The Last Release) and deal with the loss
of Sherlock.Dialog by faking it with our own themes.
3) Remove all traces of ant. The modern world is here.
1) Consolidate all of the KeyCachingService interaction into a single
mixin. Activities extend delegates which call through to the mixin.
2) Switch Activity increment/decrement triggers from onStop to onPause
in order to account for some screen locks that don't stop activities.
1) Fix up the whitespace tagging so that it's a little more strict.
2) Don't display whitespace tags that we add to our own messages.
3) Make the tag detection prompt a little more visually pleasing.
