Nebula clouds + Many Improvements

Hey there,

here's another batch of improvements. Thanks to the super useful feedback I'm getting from you lately the game is getting more and more polished, or rather less and less clunky and buggy :)

[h3]Visuals[/h3]

• The fog is no longer uniform, this finally gives the player the feeling of movement, when passing or dense patches of the nebula.
  
• Improved fog rendering.
  
• Added red light shafts coming out from the singularity, this adds a bit of color to the scenery.
  
• Added multi-colored skybox.
  
• Melter (green gun) glow has been greatly reduced .
  

[h3]Balance[/h3]

• Sentinel weapons (triangle potato guns) no longer drop, this weapon variant will be replaced later by a new one. Everyone found this weapon variant pretty useless.
  
• Hailgun heat cost has been reduced, projectile speed increased, rate of fire slightly increased.
  

[h3]Gameplay[/h3]

• More improvements to lock-on and auto-aim.
  
• Fuse has been reworked: It can combine exclusively either weapons or ship upgrades. The fused item level is averaged as before but also increased by ship's tech level. The fused item type will be random, one of the types provided in the fabricator. So if you fuse plasma weapon and death ray weapon, you will get either a random plasma or random death ray.
  

[h3]Bugfixes[/h3]

• Fixed a save corrupting bug where the game would crash if the player exited the game and entered it again more than 32 times. The corrupt saves will get auto-fixed once the game runs again.
  
• Fixed a game breaking bug where sometimes the enemies would escape to infinity (NaN km distance) and broke the players ability to use jump drive, effectively making them stuck.
  

Also made the Discord button more visible, it's been relocated to the main menu buttons.

Pew