mint-arena: Add third person crosshair
mint-arena: Allow changing third person height offset

It helps aim because character isn't blocking crosshair as much.
Made it range checked instead of a cheat. Third person is a handicap anyway.
mint-arena: Increase cg_thirdPersonHeight to 24

It makes aimming easier.
mint-arena: Add cg_drawScores to disable drawing scores box on HUD
mint-arena: Add step view smoothing to third person

Smooth view position and (your own) player position.
mint-arena: Fix Q3 scoreboard highlighted line length

In Q3 it goes off the screen. In Spearmint widescreen it's abnormally long.

Back ported from Turtle Arena.
Merge remote-tracking branch 'mint-arena/master'

Conflicts:
	code/cgame/cg_local.h
	code/cgame/cg_main.c
	code/cgame/cg_scoreboard.c
	code/cgame/cg_view.c
mint-arena: Fix jump blocked false positive in BotWalkInDirection

Jump doesn't always move horizontally enough to pass the horizontal distance check.
mint-arena: Fix crouch movement prediction in BotWalkInDirection

trap_AAS_PredictClientMovement checks for cmdmove[2] < -300 to see if bot
is crouching. This is how it decides on presence type and max velocity.
mint-arena: Fix drawing thirdperson/3D crosshair using vertex color/alpha

Crosshair shaders that use vertex color gen or alpha gen need shaderRGBA to be set.
Before they were invisible due to 0 alpha.

Q3 crosshairs do not using vertex color/alpha. Turtle Arena's do however.
Merge remote-tracking branch 'mint-arena/master'