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
encapsulated delivery icon to separate from lock

and as a bonus some tweaked text sizes and colors
// FREEBIE
No more push encoding pretense.

// FREEBIE
proguard: don't warn for test classes

// FREEBIE