Folders / tags / more filtering for filaments#444

I have quite a bit of filament. Some generic, like white or black PLA/PETG, and some more decorative, like silk copper PLA. Obviously, I use the generic ones much more often, but there isn’t really a way to filter out the rarely used ones.

This could be done with folders, but it would probably easier to use the same filters we already have (brand, material type) and let us add custom tags to each filament (could be as easy as just typing it in), and allowing us to use those tags as filters.