[New build - EXPERIMENTAL] 21w33b: Performance Improvements

The event gate now encompasses the features of the hotkey gate.
This update provides a few performance improvements.

On our test config during moment with no action it provided up to 30% FPS gains.

• NPCs field physics checks are now multi-threaded
  
• Turret rotator control logic is multi-threaded.
  

Bugfixes:

• #4119 Event gate is not visible.
  

Thanks for playing!