0.78.1 Patch

A small patch fixing some issues that were introduced with navigation for ai on custom levels

• AI should spawn more consistently where they were placed in editor and no longer on top of objects
  
• AI can now traverse most stairs in custom levels
  
• Endless spawns should now all be set correctly
  
• AI should spawn outside custom levels less frequently
  
• Overall navigation generation for custom levels should be more accurate and take less time