Added window position parameter to device creation params. For now, window is not programmatically movable. This patch is merely intended for restoring the device in the same location as with last run. Patch provided by Auria

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4472 dfc29bdd-3216-0410-991c-e03cc46cb475