allow disabling light rendering, which just blanks the lightmap as all

white (aka, filled with light) and bypasses the light collection steps..

add a key for that, F9 now. and fix player position debug not showing up
and it not using x, y but x,x
create a GL 3.2 context(previously was 3.0 context), and tell SDL2

to create a compatibility profile
if a player-hosted server hasn't been deleted, then we're still hosting

one, or cleanup somehow failed, in either case, don't create one and log
the error. This also has the nice benefit of making a second keypress of
F8 (usually accidental ;) less fatal (aka no longer crashing).