Also tweak the function for making groups of entity so that
it only adds model scales for vehicles, and so that the directory
it works in can be set. This still needs to be spun out into a more
generic function, though.

Mostly spans with divs as children, as well as writing
checked='true' instead of just checked.

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

Entities now have their templates cloned (by serializing and parsing) to allow for
a single object to be passed in repeatedly.

This reverts commit 4c58eb9b94.

This reverts commit 7182f0479e.

Still very rough around the edges...