A* Pathfinding

• Added checks to with 100% make multiple paths possible with no issues
• Removed unnecessary calculations
• Changed the #astar:eval_node function tag to check if it returns true due to being nicer to work with
• The config now only sets default values where there isn't anything set

https://github.com/CJDevZ/A-Star-Pathfinding/commit/da59fef4fc50c0837406a63561c8f5269f38feb2