Added an images file containing images for the side bar tool, which will resolve #6
Also added functionality to clicking on these icons. So far, the click to build and destroy have been rerouted to their specific icons (+ pot piece, and - pot piece)
In the future, there will definitely be zooming in and out (so we don't have to use the arrow keys)
I'm not so sure, but there might be color options for pot creation (because it'll look cool)