Entities can now be rotated. This does not affect
their height. For now, they can only be rotated by
45 degrees at a time. I will work out something nicer
later on.

Buttons/inputs/selects use the Coda font, and inputs
are more evenly sized

This can improve performance on less-powerful computers.

The font-size of the div containing each image was causing the images to start shifting
downward when their height dropped below the font-size.

This also gets rid of the groups, which were messing up the layout.

All of the entities are rendered to the canvas. It only renders images, so there are no
names, height bars, etc.