DDraw: Better flag handling in SetCooperativeLevel

[Stefan Dösinger]

This patch adds better handling for the flags in 
Main_DirectDraw_SetCooperativeLevel. The function reacts to 
DDSCL_SETFOCUSWINDOW, DDSCL_CREATEDEVICEWINDOW and DDSCL_SETDEVICEWINDOW. It 
doesn't really handle them, but it returns the correct return values. The 
patch also contains a lenghty test which I used to verify the behaviour with 
Windows 2000

This time with the logging suggestions from Oliver Stieber.

Changelog:
*Add handling for DDSCL_SETFOCUSWINDOW in SetCooperativeLevel
*Print a fixme for DDSCL_CREATEDEVICEWINDOW  and DDSCL_SETDEVICEWINDOW.

Stefan Dösinger
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