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

displayEntity() now only triggers a refresh of the world if asked, and
the scale is only redrawn if the world's size has changed

Also makes the scale input behave like the rest - change, not input

Otherwise, you could load a giant scene, close the browser, and be stuck with
it forever!

This reverts commit 4c58eb9b94.

Still very rough around the edges...

The defualt view was being referenced.

The viewport attribute is now set, which should make mobile devices show it a bit
more correctly. I updated the bottom-names to be placed properly on mobile.

The preset-size buttons were causing the values for
the default view of an entity to be shown, even if
another view was currently selected.

Very large entities are confusing to add - they appear for a brief moment
and then grow off the screen. This shows an arrow if an entity is at least
ten times taller than the viewport.

This also probably fixes bugs with wrong z-indexing for fresh entities