New flag service causes the application to run as a "service" main
overlay application.

Change the place holder action codegen to produce sorted output to
improve diff comparison clarity.

Update the code gen and tables for the proxy actions.

Ensure that overlay applications can access all input profile
extensions. Up to date with 1.0.19.

Even if the underlying device *doesn't* support alpha blending, report
that it does, to allow overlay sessions to specify it in their endframe
submissions.

NOTE: This should be conditional for the case of a client instance, but
currently we don't know if the application will be a client until
BeginSession time.