Finally! All *Id types are now first-class types rather than tpyedefs.

Finally! All *Id types are now first-class types rather than tpyedefs.
This means they are typesafe now and cannot be randomly interchanged with built-ins
anymore. Conversions to int now need to be made explicit. Take care when getting *Id
out of QVariant!

Distclean necessary. Yeah, I know.