Add icons at missing sizes, clean up SVG metadata
Adds app icon at 64px, 96px. Make icons more consistent at different sizes. This should give a cleaner look in system menus like App Finder, Whisker Menu.
Removes some leftover/draft content in SVGs.
Removes export path strings from SVGs, metadata which Inkscape added on export.
Note: Inkscape has recently changed how export paths are saved, now using relative paths, so this shouldn't be an issue in the future.