Cleanup cached preview images on uninstall

Change-Id: I9267a160fbabeb67ade2f18fdaf8d8c6acc539da
When applied theme is removed, revert to default

Fixes issue where fonts and other resources do not get reverted
properly when an applied theme is uninstalled.

Change-Id: I30c9ea018f8bffc6aff51c5b38ff1e4ec82b7b20
Insert instead of update if theme doesn't exist

This handles the case where an app is being upgraded and previously was
not a theme. and therefore wasn't in the provider.

Change-Id: I7b3f64aed2b78081822cb0f9daf0cbd638e0b15b
Merge "Insert instead of update if theme doesn't exist" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into kk4.4