Removed official maps

In the past maps got removed from the official game and in the future more will be removed respectively replaced with quality maps.

If server admins still want to host them, here are pk3s:

• Removed in 0.8
  
• Red Planet
  
  Removed in 0.8.1
  
• Abyss
  
• Lightspeed
  
• Newtonian Nightmare
  
  Removed in 0.8.2
  
• G-23
  

Removed in 0.8.6:

• Drain
  
• Oil Rig