Get rid of AI2ASS.jsx, it's not a real thing any more.
Move ScriptUI stuff to a separate file.

Get rid of scaling factor. All modern renderers can handle floating
point values for drawing coordinates.

AI2ASS can now be used by other scripts with the #include directive.

Create radio buttons for choosing how to wrap the output. Not hooked up
yet.
Recurse through pageItems to get paths in a layer.

This does not collect paths in sublayers. If you use sublayers you are a
horrible person and I hate you, and as far as I can tell, they have no
reason to exist.

This should be much faster for documents with many layers.

Also remove some lingering ScriptUI stuff.
Add sanity checks to collectInnerShadow

Previously, there would be no indication of an error on malformed
layers.

Also, toss out scaling factor stuff here too.
Overhaul output string generation to be more flexible.

A side benefit is the aggregation of previously redundant code into a
single place.
Make wrapper options actually do a thing.
Add a thuglicious progress bar.
Add compiled versions of the scripts.
Crush image files and update UI screenshot.
Make readme reflect reality.