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cell_neighbours_valid

Add deadend logic for start, end of mouse stroke.
Use remove_deadends in set_transition for 3 cell transitions.

in Grid4Transition.
Add has_deadend and remove_deadends() in RailEnvTransitions.
(should they be in RailEnv or Grid4...?)

in GridTransitionMap.

add cell_neighbours_valid, is_cell_valid to transition_map
add invalid cell detection to editor and rendertools

added on_click debug message containing transition info at the clicked cell

updated curve detection. There might be a bug in nbit calculation for levels generated using the editor notebook

Master

See merge request !12