Ladders, NPCs, input @ experimental

Iterating forward as always. Here is yet another small update for the experimental branch: [list] [*] Fixes multiple issues in immersive ladder climbing: [list] [*] 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) [/list] [*] 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) [/list]