Add tintable icon support

Add meta data com.android.settings.icon_tintable so that icons can
be marked as tintable by settings or setup wizard.

Also deprecate com.android.settings.title_res because
com.android.settings.title can do everything it does.

Test: cd tests/robotests && mma
Bug: 62258845
Change-Id: I063be62867dd8a81ab35ff3fe8a85c61e4c6f17d