Make use of the code generator.

Make use of the code generator.
Changes include:
* Buildsystem changes to call the code generator.
* Register classes and enums with QGLIB_REGISTER_TYPE.
* QGLIB_GTYPE_WRAPPER becomes QGLIB_WRAPPER and no longer defines
  the member type() method.
* Use GetType<T>() instead of T::type() in GetType<RefPointer<T>>.
* Rename some of the enums in Type::FundamentalType so that they match
  the coding style that the code generator expects.
* Other minor compile fixes.