Style previews [1/3]

Change-Id: Ifed0ef7829eb61492a39395e8140b99f01c5e6a3
CM11 Themes: Put overlays in their own group.

Overlays will now be added to their own group and the
target group will contain a pointer to the overlay
package to be used in getResource and getBagLocked.

Change-Id: Icc6c6eb791f04966e68dbc099eae8e7129546414
CM11 Themes: Remove type matching restriction

Change-Id: I5a8ac8ff1794350ff9dc03b378c704bfb97d0a9e
CM11 Themes: Allow forcing idmap (re)creation.

Change-Id: I9f5938e9b1052da83b7f2cd7b1ff6f1ed270db6b
CM11 Themes: Use theme name for audible name.

Change-Id: Ib841cb80925b0f3f5ac770e00df04515849e9360