Fixes and Updates

• Fixed viewdemo command crashing for certain demo files
  
• Fixed ammo boxes visibly spawning when purchasing ammo
  
• Security fix to client disconnect handling
  
• Security fixes to console command handling
  
• Security fix to client/server communications
  
• Security fix to model loading
  
• Security fixes to BSP and WAD loading
  
• Setting _cl_autowepswitch to 2 will now enable auto weapon switching on pickup of a better weapon except when holding Primary or Secondary attack