Phone: Add blacklist unknown numbers functionality

	This way you can choose to block numbers not
	in your contact list

	Add counters to missed and blacklisted calls
	notifications

Patchset 4:
	- Remove counters for a single call
	- Reformat
	- Move the dependency of the "unknown numbers" preference
	  under that of "private numbers", that is the logical
	  parent

Patchset 5:
	- Fix formatting

Patchset 6:
	- Solve a bug in which a private number would be blocked
	  as unknown, with the message "Unknown number: 0000"
	- Code the dependency between the two preference sets,
	  "Block private numbers" and "Block unknown numbers"
	- Make some code lines cleaner

Patchset 7 - 13
	- Some more corrections, spaces and tabs fixing.

Change-Id: I0497dff62f5278da6bd5d441b8359294a9b2afd3

Conflicts:
	res/values-it/cm_strings.xml
	res/values/cm_strings.xml
Do not attempt to do any matching against the '0000' number.

Additionally, uncheck 'block unknown' when its dependency 'block
private' is unchecked to make the shared pref values follow the expected
behaviour.

Change-Id: Id62e45a374c8c104924e6397f90c274ec9726cb8