removed Node, neighbour -> less memory | Ptofiling Astar| Astar(0,100) ~= 16 s| don't wno why
remove heapobj -> reduced time ~1-2 s
now using list.index instead of looping over it
optimized graph loading
Used Python tricks (using less '.' and ...) to speed it up
Fixed manhattan lower bound ((dx + dy)*100) -> faster Astar ~ 200ms
added UI and some original Map drawer fixes