Feature request: per graph debug gizmo color customization

When using multiple graphs for the same AstarPath, it’s not super helpful to see all graphs overlayed on top of each other, as they are all the same color and it’s quite visually noisey. It’s be great to allow each graph to define their own gizmo color somehow.

I think this would be pretty useful. Currently, as long as your graphs are contiguous you can set your Graph Coloring to “Areas” to have them do this, but it falls apart if there are gaps since one graph will have two or more colors.

I’ll tag Aron on this to review :+1: