[1/7] Base: Blacklist support

telephony: https://gerrit.omnirom.org/#/c/6347/
InCallUI: https://gerrit.omnirom.org/#/c/5669/
Mms: https://gerrit.omnirom.org/#/c/5671/
Settings: https://gerrit.omnirom.org/#/c/5011/
TelephonyProvider: https://gerrit.omnirom.org/#/c/5012/
Telephony: https://gerrit.omnirom.org/#/c/5010/

Change-Id: Ic5a59be11f76b4a9eba075d9c3525086b3ee389e

[1/7] Base: Blacklist permission

There is no permission check for blacklist.
So any app can edit the blacklist.
Add a system-only permission to prevent this.

Change-Id: I1d817e7127bb892aa6f4d4b22fdfd3efb4baa3fa

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/strings_custom.xml