widl: Add support for standard target options to allow building the right typelib kind when cross-compiling.

widl: Write the local stubs file based on the parsed list of statements, rather than using hooks in the parser code.

widl: Write the generated file containing IID, DIID, CLSID and LIBID data based on the parsed list of statements instead of using hooks in the parser code.

widl: Store the size of a pointer in a variable instead of hardcoding the value of the host compiler.

Generate a BaseIIDList for delegated interface, and point directly to
the methods that have been defined in the same file instead of
delegating them.