make heatmapPathfinder mobile-friendly

[Geokureli]

double the size of tiles (reducing the total tile count), remove key press and right click checks and allow everything to be done by clicking

• hold-pressing a mcguffin/seeker will drag them
• pressing on an empty tile start creating walls
• pressing on a wall starts removing walls
• an inactive seeker if placed in the corner, it starts seeking when placed and is replaced by another inactive one