Xcursor theme support

[Malte Starostik]

Hi,

the attached patches add basic Xcursor theme support to KDE.
With KCursorEffect::setTheme() it is possible to change the theme on the fly. 
For this to work, the QCursor hack and kwin's participation is neccessary as 
all cursors must be recreated, especially the root window's.

Any suggestions for a different approach or can I commit?
{yes, documentation for KCursorEffect is on its way}

-Malte

PS: when replying to kwin@ please keep me CCed.
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