[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
Signed-off-by: scott <scott@ubuntu>

Conflicts:
	res/values/custom_strings.xml
Revert "Mobile Network Battery Saver Mode"

This reverts commit 22ba716dd0f38e744faaa4025fc365b0d439c6ff.

Signed-off-by: scott <scott@ubuntu>

Conflicts:
	res/values/bs_strings.xml

Change-Id: Id6022fa56b7090d7b379c0f3b119ba90f39b1cc8