Merge: from navmeshsurface_optim
- Optim: Ghostships now use a static, detached navmesh, saving us on navmesh re-integration every physics step
- New scientists adapted to work with detached navmesh
- In C+S editor, we now automatically exclude client-scene entities from dynamic navmesh gen
Tests: spawned all ghost ships, observed scientists patrolling, dogfighting, sprinting