* PrimitiveType is now an interface.
* VoidKind is now VoidType.
* FloatKind is now FloatType.
* The integer kinds are now IntegerType with IntegerKind.
Handles were previously assigned in the model name import pipe, but as
they are not expected to change often, they can be improted in the
Clifter. Additionally, in some cases it may be desirable to emit C
using generated names instead of those imported from the model, in which
case no handles would be available.
Lauri Vasama