Interop: Removed unused structs and constants and added warnings in libhb code to update the ones that are used. Broke out types for each struct into their own file. Switched all references to hb_handle_s to IntPtr and deleted that non-working struct.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5786 b64f7644-9d1e-0410-96f1-a4d463321fa5