In path finding GetConnections considers connections to already closed cells and calculates the cost for them. The caller afterwards ignores them. These are 15% of all connections.
Add GrantConditionOn*Layer traits
This allows to
- drop some booleans from Locomotor
- drop a good part of the subterranean- and jumpjet-specific code/hacks from Mobile
- grant more than 1 condition per layer type (via multiple traits)
- easily add more traits of this kind for other layers
