Optim: Reimplement AI-Cover/Move-Point debug drawing as a utility function instead of FixedUpdate
- Also now requires both CLIENT+SERVER being active in the editor (as it's part of ServerMgr's FixedUpdate step)
- Will reconcile the client cmd line arg but server logic in next CL
This wins us 5.5ms on 6k procedural map in editor
Tests: loaded a 6k procgen map on 1337 seed and checked the profiled. Tried enabling the debug flag, but it nukes the perf. Tested flag on craggy by spawning junkpile_j - saw the debug graphics.