GUI Tweaks & shipyard upgrades

I'm trying out a new font. I'm also slowly replacing the yellow accents wherever I can with blue ones because it looks more stylish. I am still looking for an artist for a compete GUI rework, but until then I will improving little bits here and there to keep making it better and better.

Apart from that I also:

• Added The Rattler
  
• Added The Megarepeater
  
• Added The Gauss Slinger
  
• Added The Agoniser heavy ship
  
• Replaced shipyard flak with Shipyard Super Autocannon
  
• Improved shipyard beam weapon and beam costs
  
• Added the Overwhelmer missile pod
  
• Removed unneeded json volume load file
  
• Added several checks to try to prevent the volume-slider-reset-bug