Minor cleanups
Cleanup GMOD_Player class a little bit
* Moved public fields to private for those that already had accessors
Fixed infinite loops when calling DrawModel from Pre/PostPlayerDraw
* The hooks will no longer be called while they are already being executed
Better descriptions for gm_snapangles and gm_snapgrid
Merge small fix for LuaJIT
Optimized some CVEngineServer functions to do with looping over player list
* Also fixes some pointless compile warnings
Fixed more compile warnings
Optimizations for GM:PlayerCanHearPlayersVoice usage
* Removed IVEngineServer::GMOD_GetPlayerIsSpeaking & GMOD_ShouldUpdateVoiceMasks, CBasePlayer::IsUsingVoice, C_BasePlayer::ShouldGoSouth
* Moved certain gmod fields at the end of CBasePlayer and C_BasePlayer to be private, rearranged others
* GM:PlayerCanHearPlayersVoice will no longer be called for non speaking players when any player speaks
* GM:PlayerCanHearPlayersVoice will be called for a speaking player if it was called too long ago (0.3 seconds)