TRDS:[Telephony] Dark Dialer (2/2)

inverts Call Settings from Dialer

Change-Id: I3ca081fde36eb16f014f648ed3d4144a496944f7
Mobile Network Battery Saver Mode

When idle (screen off) switching to 2G can help extend
battery life as 2G generally uses less power than 3G or LTE.

    + 30 seconds after screen turns off, set network type to 2G
    + If a music player is active (playing), do not set network to 2G
    + When device is unlocked, reset to orignial network type

Settings -> More -> Mobile Networks -> Battery saving mode

Change-Id: Ief8f203f157af3a1484966d43fcc07fd160e4ad7
[2/3] Telephony: allow disabling non intrusive incall ui
[2/3] Flip to Mute/Reject Call