Whiteboard (WIP)

This whiteboard is still a work in progress. Currently, you can draw with the pen tool (hold left mouse click down, or use your finger on a touch screen), erase with the eraser, and move lines and objects around with the hand tool. I will be adding more features later, including the ability to save and load svgs.
Quick note: the eraser and hand tools may glitch on touchscreen. I'm currently investigating a fix.