Better simulation :)

Change Summary:

Adds brief transition screens between legs of the race
Title bar reflects which leg is being run
Added a "START" and "FINISH" label to a leg's start & end states
Agents that have finished their race are sorted by decreasing score (i.e., the agent that did best on leg i goes first on the ith set of ledges above
Each agent's score is displayed beneath them
Added "Headstart" functionality.
    If a TD agent finishes 10 steps on world 1 before the other two, the TD agent on world 2 starts the simulation    
    on its tenth state.
Agents are displayed in different portions of their tile based upon type (if three agents are in the same state, they are all visible)