0.92.3 - Nuclear Procedures

This is a content patch and science-fiction hardening release. Changes:

• New procedural plumes consulted and approved by a nuclear engineer. They take into account specific impulse, thrust, exhaust temperature and propellant composition to deliver scientifically-accurate (and pretty!) exhaust plumes.
  
• Graphics detail setting now affects much more elements, giving you better tool to tune performance of the game.
  
• Additional intermediate bloom setting for players who don't like default bloom, but don't want to disable it altogether either.
  
• Fine-tuned physics settings of ships.
  
• Stability and performance improvements.