Add Feren OS (2020) palettes

[dominichayesferen]

New Preset: Feren OS (2020) and Feren OS (2020) Dark

Description

Feren OS's light and dark colour palettes, as of the 2020 Theme Redesign, officially ported to Gradience. The original colour palette was made by @dominichayesferen (me).

Palette

• [x] None

Screenshots (optional)

Wallpaper

Checklist

Before submitting the PR, I checked:

• [ ] I've only modified one preset
• [ ] I've added the URL to my raw preset in presets.json
• [x] I've checked the format of each json files I modified
• [x] (optional) I've added screenshots
• [x] The preset name is following preset naming guidelines.

Publication

• [x] I want to add my preset in the preset list.

Thanks for your submission we will review and merge it as quick as possible.

[daudix]

Looks good to me, but it have the same issue as #86, dark variant uses shade and outline colors from light adwaita and not dark

[dominichayesferen]

Looks good to me, but it have the same issue as #86, dark variant uses shade and outline colors from light adwaita and not dark

Shades are now based on the source material's border opacity, whereas the outline colour on dark is intentionally black as that is how it appears in Feren OS.