Significant updates to the Profile framework

Needed By: Additional updates to the Profile framework
packages/apps/Settings project
Related Change ID: I9db0e576f5ecd1a9eb7f1efb16c61603268d1297

These changes include:
- Profiles are now referred to by UUIDs instead of name values.
- Changes to profiles now require the android.permission.WRITE_SETTINGS
permission.
- When a new profile has been selected, the
android.intent.action.PROFILE_SELECTED
broadcast intent is sent with extra string data for the name, UUID,
lastName, and lastUuid (lastName and lastUuid representing the last
active profile, before the switch).
- Calling identities are cleared for actions that may require
additional permissions. Specifically, this includes the broadcast
intent and the persist() function.
- Various tweaks for the upcoming Status Bar Indicator, as requested
by Sven Dawitz.

Change-Id: I9f5ba03896ac2af5405fdb2075889247913771ad