MSIM: Refactor and fix msim settings

This removes all the copy/paste code in CallFeaturesSettings.
Also fixes per subscription voicemail settings.

Change-Id: I79990b5c13c059ef6f0fe3ede9b59c20af673c3e
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_services_Telephony into android-4.4