commctrl: initial button theming support

[Frank Richter]

Frank Richter <frank.richter at gmail.com>
Add theming support. When comctl32.dll is attached to a thread, a CBT
hook is set up for the current thread which intercepts all window
creations. There, the class name of the window is checked. In case of a
known class, the window is subclassed, and the subclass is handling the
theming-related stuff.
Add initial theming support for the "Button" class.


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