chore: use specific errors instead of GenericError

fix(combat): do not return successfully when walk position is equal to target position

Merge pull request #32 from Rutherther/combat

Add combat extension

feat(pathfinding): add user cancelling to walk manager

feat(pathfinding): create custom pathfinding

fix(combat): adjust walk in range behavior to not sit idle too much

fix(combat): dispose cancellation token in use skill

feat(combat): reset walk in range operation if the target moved

fix(combat): support minimal walk in range distance 0

feat(combat): add combat operations