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' into kk_mkt

Conflicts:
	res/xml/call_feature_setting.xml
	res/xml/msim_call_feature_sub_setting.xml
	src/com/android/phone/CallFeaturesSetting.java
	src/com/android/phone/MSimCallFeaturesSubSetting.java

Change-Id: Icba4cc47352992f93e5cf8dab1752e1a624b8762