materialize conversation item indicators

// FREEBIE
remove unused image resources

// FREEBIE
optimize new assets

Thanks to @pejakm for pointing out the emoji optimization.
// FREEBIE
Potential fix for BroadcastReceiver crash.

// FREEBIE
use latest appcompat and build tools, add dagger pin

// FREEBIE
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into jxmods-full