Make theme change broadcast a protected broadcast.

Change-Id: Ic24c840685d18d133dc73ff2637c041c4775f197
Themes: remove unused code

Change-Id: I5ee8de962c40ddc5fcfbbc0332a9e389223e716c
Themes: Delete icon resources during uninstall

Change-Id: Icf247642f9d246c8826f3394f873e4b434ad2b3f
WallpaperCropper: do not display null bitmaps

It is possible that themes can include a corrupted bitmap,
and the lockscreen will try and display a NULL image resulting in an
empty thumbnail and applying it will cause the app to crash.

Change-Id: Ie0770486a9d58050a5f296a219d844a39937421e
Signed-off-by: Roman Birg <roman@cyngn.com>
Themes: Update last postFinish call

* Previous patchset changed postFinish function signature.

Change-Id: Ibe07435e274054c7203504bc4b0877b4df006893