Controlix Code-new

* Misc. tree pruning

* Added POSIX target files from internal copy in src/PDCLib/

* Removed unused src/PDCLib/platform/win32/ directory.

* Remove spurious src/vc/ directory
* Misc source-level cleanups

* Remove src/freertos/
* Remove src/pdclib/ (old version of PDCLib)
* Add src/PDCLib/ (new version of PDCLib

* Initial import of rt-thread/

* Removed old SpecC support
* Removed old supermake support

* Major re-architecture:
** Added new src/systemc (Accellera reference SystemC compiler,
** src/specc*/ dirs removed
** Added new src/libcxx (LLVM's libstdc++)
** Added new src/pdclib/ (LibC replacement)

* Manual-linking fix in 'Makefile'. Source compiles, links and runs now.