[win32k]

[win32k]
- Modify how non-queued messages are send that originate from the Win23k subsystem.
Non-queued messages must go directly to the windows WNDPROC and not through the message pump (previews ROS behavior).
More importantly sending these messages must not cause the sending thread to block waiting for a reply.
- Add a messaging handling function that always sends message from Win32k to the windows thread without waiting.
This will also allow the implementation of message call back later.
- Modify PackParam and UnpackParam to accept a BOOL value to determine whether LParam needs to be allocated from NonPagedPool.
Use with new message handling as if message sent to another thread have any pointers they must be allocated from NonPagedPool.
- Fixed broken logic in can_active_window function and co_WinPosShowWindow.
- Fixed broken logic in co_IntSendActivateMessages.
The WM_ACTIVATEAPP message was being sent to every window belonging to the desktop twice.
Once with flag saying window was activated and again with deactivated.
- These changes should fix bugs #969, #3171, #4501, #4676, #4677, #4948.

svn path=/trunk/; revision=47126