Draw Update: CSS, Layout, and Controls

Styled the page, but it probably only looks perfect on my screen. I'll
fix that later. The form is now partially functional and looking good.
You can now change the shape through the form instead of using the m key
and typing it in. I still want to add AutoCAD-style shortcuts for
changing shape modes though.

Sections still aren't working, will hopefully fix for next update. Also
want to be able to select shapes (and their sections) and have the info
show up in the sidebar. Placeholder is there now.