Convert restrictions provider to a service instead of a receiver.
Add a way to get pending responses from restrictions provider.
Add AbstractRestrictionsProvider.
Add a callback API for responses.
Removed some constants in RestrictionsManager.
Added new constants for errors and error codes.
Much improved javadocs.
Bug: 16176009
Change-Id: I838a50fabc80b94b632294b3a55cd5d8092acf55
Mechanism to register a provider for requesting an
administrator to respond to permission requests.
Request format and response format constants.
Description of manifest template for static restrictions.
Int type introduced in RestrictionEntry.
Needs more javadoc and better description of manifest templates,
including specifying the XML attributes.
Change-Id: I5a654d364e98379fc60f73db2e06bf9a8310263d