bge fix: framing mode "Expanded" not updated when resizing blenderplayer
now, with a 'resize' routine for the engine we can/should also recreate some
buffers that are created only at init time (e.g., 2d filters, dome fbos, ...).

This bug was always present in Blender (since 2.49 at least).

Bugfix supported by NF-UBC Nereus Program as part of the development
of OceanViz/NereusViz

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55978 954f8c5b-7b00-dc11-b283-0030488c597c