Added pathfinding and spiders

I have added pathfinding to Ant Colony. Now right clicking the mouse will make the selected ant move to the mouse position. I have been working on the AI for the ants and fixing bugs. Mining ants now find diamonds and bring them to the queen. The queen "eats" the diamonds and lays an egg. The egg hatches into another ant. I have also added spiders and they are playable for now. I plan to add teams and make spiders part of an unplayable team.