Add PrivacyWatchDog.java (from Collegedev/Pdroid2.0)

This is exactly as it would be found in the Pdroid2.0 1.54 patches.
Rename PrivacyWatchDog to PrivacyWatchdog and clean up style

AOSP uses a 'Watchdog' name in theirs, so that is the reason for the change. Hopefully
we will not end up paying for this later on...
Remove public access to some Watchdog variables (author: wsot)
Camera.java: Improve logic of checkIfPackagesAllowed method; remove unused logging method

The logic should be slightly more efficient as well, since this removes the call to .length
each pass. The logHelper removal probably should have been done when adding PrivacyDebugger.