Add Zorin OS 16 palettes

[dominichayesferen]

New Preset: Zorin OS 16 and Zorin OS 16 Dark

Description

All of Zorin OS 16's themes' colour palettes unofficially ported to Gradience. The original themes are by Zorin Group.

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 awesome! one thing that should be fixed is that dark preset variants use shade and scrollbar outline colors from light adwaita, while it should be from adwaita dark, otherwise everything is OK ;)

[dominichayesferen]

Looks awesome! one thing that should be fixed is that dark preset variants use shade and scrollbar outline colors from light adwaita, while it should be from adwaita dark, otherwise everything is OK ;)

Shade colours are based on the respective palette's foreground colour, being so because Zorin OS's official theme designs use separators in the exact same manner.

Additionally, the scrollbar_outline_color value is based on the background colour of the respective accent, based on the fact the Adwaita Dark preset similarly employs rgba(0, 0, 0, 0.5).

See below screenshot of Zorin OS's official 16 blue dark GTK3 theme, namely the separators:

[daudix]

I meant the @shade_color, it looks a bit odd to have white shadow in light mode, but if original theme have it like this then no problem