Everything should be passing a list of entities to a function that
computes a bounding box and fits things now.

The viewer would try to call updateEntityElement, but the
entity would be deleted, causing an error.

The movements occur more rapidly, and transitions are disabled
during the pan.

It was moving the entities left and right. Now, it moves
the camera left and right

Otherwise, whilst the option doesn't appear in the dropdown list,
it will still be selectable via the keyboard, causing an error.

Only Fen has a tag, and most characters lack species,
so it'll be a while until this covers everyone.

Entities can have now a default view other
than the first one provided for them.

Units that didn't match the internal base unit
were showing up wrongly.

This also fixes a bug that caused the initial value for
each attribute to be wrong if the default unit didn't match
the unit used internally.

This way, small values don't just become 0, and large values don't
have tons and tons of digits