Change to sane values for PL color in scoreboard
Fix gamma somewhat, it is a mess and needs to be cleaned up

Right now gamma ramps is calculated elsewhere. Needs to be moved and
only done in one place with SDL instead.
Minor colourization for connection messages
Rename function, make mouse4&5 work, add FULLSCREEN support
Initial fixes for fov calculation - consistent fov

Use the same fov value across different resolutions instead of
manually specifying wideaspect and getting a new fov calculated (for a
16:10 monitor) etc. Code originally taken from fodquake