Support MultiMon(full screen in second display)

[iluck]

Set the game window which running full screen as well as non full screen game in the center of the current display, no matter the primary display monitor or extended display monitor.

Verdict the Dolphin window shows on the primary display monitor or extended display monitor. There is no change of resolution when the game window show on the extended display.

Code :
http://code.google.com/p/dolphin-emu/issues/detail?id=1433

More(Chinese):
http://iluck.org/156.html

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