Ladders, NPCs, input @ experimental

Iterating forward as always. Here is yet another small update for the experimental branch:

• Fixes multiple issues in immersive ladder climbing:
  • Fixes being able to climb into the floor and through ceilings
  • Fixes not being able to move orthogonal to the ladder (move closer or farther from the ladder while climbing)

• Fixes combined ladder climbing
• Fixes NPCs turn speed being fps dependent (slower on higher fps and vice versa)
• Adds versioning to the actions manifest (should fix issues when upgrading to the new input scheme)