Fixed|Client|Map Renderer: Various GL state mismanagement issues
Changes to the GL state made during drawAllLists() (rend_main.cpp) are now explicitly reverted when the relevant draw scope ends. Also fixed an issue in the old version 1 bitmap font renderer.
Switched to using de::GLState for most blend op changes.
Fixed|Client|Map Renderer: Various GL state mismanagement issues
Changes to the GL state made during drawAllLists() (rend_main.cpp)
are now explicitly reverted when the relevant draw scope ends. Also
fixed an issue in the old version 1 bitmap font renderer.
Switched to using de::GLState for most blend op changes.