V2.0.1 Filament library and bugfixes

The webUI now has a catalog of the filamentcolors filaments, that can be simply added to the filament library. This was in the code since around version 1.4, but I had nowhere to really use it.

If you use the filamentcolors catalog, please donate to their cause. Even a small donation helps them in maintaining and expanding the library.

Otherwise this is mainly a bugfix release that squashed some smaller bugs:

• Layer pruning was off by one.
• Pruning cancel was not always working in the webUI
• .hfp files with broken filaments would break
• Flatforge overlap bug fixed.
• --best-of config bug fixed
• 409 bug in the webui fixed.
• Adding or removing an active filament now shows a toast error message.