committed stpatch20110110.diff by Jonas Kümmerlin

committed stpatch20110110.diff by Jonas Kümmerlin

* Viewport is restored properly after drawing lightmap (was set to 0,0,SCREEN_WIDTH,SCREEN_HEIGHT before)
* Menu size calculation now minds size of current selected string in STRINGSELECT items -> overlapping bugs disappear
* Magnification is saved in configuration file
* default magnification is auto (maybe talk about that again)
* auto magnification does now downscaling on resolutions smaller than 640x480
* magnification, aspect ratio and fullscreen resolution controls in options menu now display the current value

git-svn-id: http://supertux.lethargik.org/svn/supertux/trunk/supertux@6660 837edb03-e0f3-0310-88ca-d4d4e8b29345