Added travel method

n1 is current node, and n2 is the node that it is traveling to but I
don’t know how to call that in the draw function in the main tab. the
method will calculate the distance and move along that path.
Bug with node

when I click on n9 or n10, it changes the entire graph strokeWeight to
the current node. also it changes the player but this doesn’t happen on
any other node.