LangaugeKit fixes:

Fixed incorrect module_t generation so that LK now works with recent libobjc (tested by ericwa and me).

Added documentation to ABI.h.

Fixed ABI support for NS* structures on FreeBSD/i386.

Fixed parsing of ObjC type definitions for structures in structures (fixes NSRect).

Now passes almost all of the tests in Günther's test suite on FreeBSD/i386.  Correct definitions in ABI.h are required for other platforms (patches here very welcome).