Add new matte colors

[spuder]

Add support for the new Matte colors

https://www.reddit.com/r/BambuLab/comments/1ik2eq8/new_pla_matte_colors/

[mytechguyri]

Just my two cents on this, but I really don't see the value to spending time on this one.... Okay, Bambu has released a bunch of matte colors.... but Bambu filament already has RFID encoding of those colors, so you're not going to actually use any of these on the Bambu matte color filaments.... and if you're going to use these colors on 3rd party filament, the device already fully supports RGB hex colors, so you can literally configure any color in the rainbow by simply programming the correct RGB color code on the tag. thankfully, I've also seen more and more filament manufacturers are listing the RGB color values of their filament colors. I'd much rather see the device's UI support direct input of RGB color values, kind of like the "custom color" option in Bambu Studio/Orca Slicer, or at least make the color hex field editable instead of limiting us to the dropdown colors