Updates

Just added a couple updates which I've been wanting to put in for a while. These were both suggested by Cheapracer on the Locost Builder forum.

Added type-in support for roll and bump controls

    Now, it's possible to just type in values in the bump/droop and roll angle inputs. Before, the only way to change the values was to drag the arrow controls on the graph. 

Added control for adjusting roll and bump together

    There's now a free-drag control on the graph. Left/right movement adjusts roll angle, and up-down movement adjusts bump/droop. This may make it easier to see how the vehicle rolls around a particular point, such as the roll center.