Added a tracker to the minimap

I was working on this one for hours, but you guys are gonna love this.
![image](https://cloud.githubusercontent.com/assets/844422/4042988/50b84c1e-2d0b-11e4-9de4-d5eeb3dca719.png)
You can now click on any of the map rooms on the larger minimap, and it will pathfind the shortest route to that room, and then show it on your normal minimap as you're walking along. No longer will I get lost on Tarkus!