[3/3] Flip to Mute/Reject Call

Ported over from 4.2 implementation (thanks sasikumardr for that)

Original author of this patch was bugadani

We did just a cleanup

Provide easy mute and dismiss functionality for the phone application.

Available actions:

0: mute ringer
1: dismiss call
2: no action (default)

PS:
- fix NPE

Change-Id: Ia10df0045e9919c6b7efc97857abaeba246c365d
Revert "Make incall screen glopad background themeable"

Change I6a0a120662e4e45b5282a763c8ccf41d29c6d470 was supposed
to make only bottom half of caller photo semi-transparent. Instead
it also exposes in-call buttons at the bottom of the screen behind
the glowpad. This has looked plain broken for months.

This reverts commit 3073f8760c82198a80cf8efe3fe0e3b2804852c2.

Change-Id: I38d2b8aefdaa77385c863b97221e88f0da6a97e2
InCallUI: HU translation

Change-Id: I56f6456a4971c2f414a66c8d0b4a8ed27c8540e0