Change Portability in module header of exe:Main to unix
Instantiated most of the modules defined in the immage for issue #2

- The generated executable is a little test of the dyre library which adds
  windows to the set if given a positive integer and prints out the number of
  windows

- Added some basic data structures (with only a few fields defined)
	- Window (a persistable wrapper around a raw Word32 value which can be
	  used to identify a "real" window in XHB code)
	- WM (the immutable Window manager state)
	- WMState (the mutable window manager state)