mint-arena: Have spectator always be in first person

Flying around in third person with no body is weird.

Back ported from Turtle Arena.
mint-arena: Show player team when finished connecting each map

I made it only happen when player first connect to server, but it really
should be shown each map to let people know they finished loading the map.
mint-arena: Expose control of more bot trace contentmasks to Game VM

Also expose pass entity num for AAS_DropToFloor.

To maintain the same behavior in game VM;
  - AAS_DropToFloor: Use passent 0, contentmask CONTENTS_SOLID
  - Others: Use contentmask CONTENTS_SOLID|CONTENTS_PLAYERCLIP
mint-arena: Fix double team change message

Only print team change in ClientBegin if first spawn.
ClientBegin is called at connect and team change.
mint-arena: Fix smoothing crouch view height change
mint-arena: Update view origin variable for unused neck pivot code

I change the variable name that should be used, so update this to avoid confusion later.
mint-arena: Make ai_goal.c and ai_weap.c use Q_strncpyz
mint-arena: Remove redundent cursorPos = 0
Merge remote-tracking branch 'upstream/master'