IPrivacySettingsManager: Add some method definitions from PDroid2.0

There are still several debug methods from OPD/wsot. They may be obsolete with the new
PrivacyDebugger. I am leaving them for now, with a TODO to revisit.
Add PrivacyCache (author:CollegeDev)

This is meant to speed up access to settings, lowering battery consumption and increasing
speed.

This is just as it is found within PDroid2 1.54 patches, except with all of the tabs and
space-only lines removed.
Fix unclosed quote

I did it...it was ME!