starting to work on heuristic mods for looping routes
in a mess here
A* modifying, breaking things maybe
makes loops. terrible loops, but loops nonetheless.
esc key functions when overlay is reset, to go back to already-rendered route
LOOPS BEAUTIFUL LOOPS -- need to refine heuristics slightly but LOOPS
deleting
deleting unused pathfinding files
renamed pathfinding file
resolving merge from astar_heuristics