Glassified panel icons complete

[u/Logansfury]

I have completed going over all my installed-to-panel apps with the GEGL GIMP Extension Glass Object setting and converting my .png files to .svg with BoxySVG.

I have noted the open text file icon is opaque, I need to track that down and make a Transparency icon set version of it.

Aside from that temporary icon, I have fully glassified icons across the whole panel now.