Add debugging support

Add step by step debugging support and Visual C++ 2008 project to work in.

Notes and tips:
* Breakpoints don't work. Use `__asm int 3` instead.
* To stop debugger on exception instead of showing error box check the exception in *Debug\Exceptions* dialog,  *Win32\Access violation* is the most common case.
* "Go to definition" works even from `*.asm` files.