telephony: Disable MSIM settings if unavailable

 * These activities share the same intent-filter as their non-MSIM
   counterparts. While this makes sense as a quick hack, it causes
   a UX issue when an app tries to launch one of these. An example
   is Google Voice- when it's time to update your voicemail settings,
   you're confusingly presented with a dialog asking to select
   which "com.android.phone" to use.
 * Disable the activities entirely if MSIM isn't available.

Change-Id: Iedeaf84f343ea0ee290275941cd55862a687800a
[2/3] Telephony: Flip to Mute/Reject Call

Call Settings - add menu entry

PS2 - PS4: Code Cleanup

Base: https://gerrit.omnirom.org/#/c/4668/
InCallUI: https://gerrit.omnirom.org/#/c/4669/

Change-Id: Ic011c5b9e10439fc900b1302f7e07dde494b2e5b

Conflicts:
	res/values/custom_strings.xml
	src/com/android/phone/CallFeaturesSetting.java

Telephony: fix Flip to mute/silent

maybe fix http://jira.omnirom.org/browse/OMNI-412

Change-Id: Ie12ff6aab6ffdaf8638e0ac39f3911f7ecb8793c

Conflicts:
	src/com/android/phone/CallFeaturesSetting.java
[2/3] Telephony: Incoming Call in Background

Patch ported from 4.2 which was done by our lovely HCP. A
very popular one so we bring it back and adapt it to 4.4

Allows user to set that Incoming Call UI will remain in background
if screen is on. Instead, a notification is added to StatusBar, which
can be used to bring up the Incoming Call UI. Ringtone and vibration
still occur as per system settings.

This has the same effect as apps marked as "immersive". It prevents
the incoming call from backgrounding the current activity.

PS: reorder settings a bit

Change-Id: I159bd817ebcc39a0733f9433feb29b310adbc2aa

Conflicts:
	src/com/android/phone/CallFeaturesSetting.java
Telephony: RU translation