Dwt-win Progress

[John Reimer]

* Added activation context support for automatic XP Theming: thanks to doob.
* Several bugs fixed including Sash, ExpandBar, and Scrollbars: thanks 
to Frank

File size of ControlExample.exe:

No debug Info: 2.03 MB
UPX packed:    592 KB

There is still more room for binary size improvement once bugs are 
cleaned up in the source.

I'm also looking forward to OpenGL integration and more dwt-examples to 
help test the win32 and linux versions.

-JJR