[New build - EXPERIMENTAL] 21w13a: Spaceship and build SFX

This builds adds some revamped Spaceship, hovercraft and building sounds effects.

Improvements for spaceship sfx:

• more connected to player input
  
• Deals better with perspective
  
• Account for ship size.
  

Bugfixes:

• #3689 Symmetry overlap check do not work sometime.
  
• #3697 Ship fall through the ground when far away.
  

Thanks for playing!