Also add a 'setup' script that both creates a directory and runs
the bounds-fixer script on it

Also fix up the bounds script to delete old files

Also update the add-bounds script to also
rename files

Firefox won't draw SVGs to a canvas correctly without width/height
attributes (even if a viewBox is present). This commit inserts those
values where needed and removes the Firefox check from the click
detection code, so it works properly (and screenshots are fixed, too).