materialize conversation item indicators

// FREEBIE
remove unused image resources

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optimize new assets

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

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use latest appcompat and build tools, add dagger pin

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encapsulated delivery icon to separate from lock

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

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proguard: don't warn for test classes

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Move targetSdkVersion back down to 19.

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Update gradle-witness and actually use spongycastle.

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proguard has guarded its last pro

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make the light theme light

Fixes #2111
Tested on GB and LP
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Update language translations.

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Fix escaping in danish translation.

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Add jobs for pending push messages during migration.

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Bump version to 2.3.0

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Update to latest zxing QR code scanner.

Closes #2078

// FREEBIE
Make GCM re-registration failure notification based.

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rollback to appcompat v20

v21 appears to just not be ready for production given the bugs.
// FREEBIE
Don't completely disable GCM.

// FREEBIE