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.

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

Each entity now has an info object, a views list, and a sizes list.
This will allow for more complex bio/description text