Statusbar clock and date customizations

Credits to slim

Conflicts:
	res/values/purity_arrays.xml
	res/values/purity_strings.xml

Conflicts:
	res/values/simpleaosp_arrays.xml
	res/values/simpleaosp_strings.xml
	res/xml/display_settings.xml
	res/xml/status_bar_settings.xml

Change-Id: I36299699eb21628dd8c9a90570cbf509ee01c47d