Add icons at missing sizes, clean up SVG metadata
@Tamaranch Should all icons/rDNS names be lowercase? I've noticed there are only a few that aren't (like Dictionary here) and I've seen a few MRs merged in other projects where they have been lowered. If so I can submit additional MRs to address that while I'm at these. Also, sorry if all these icon MRs are annoying, but I figured I'd just go ahead and start going down the line and try to get them all done. I know it's pretty superficial/trivial I guess but hopefully it'll help in some cases (esp HiDPI).
Thanks!
Adds app icon at 64px, 96px. This should give a cleaner look in system menus like App Finder, Whisker Menu.
Removes export path strings from SVGs, metadata which Inkscape added on export.
Note: Inkscape recently changed to save export paths as relative paths so this shouldn't be an issue in the future.