[SRU] Backport icon-changes from groovy to focal

[Muqtadir]

[Impact]

 * focal users will gain the addition and refinement of more mimetype-icons, scalable-icons, devices-icons that were previously not present

* will make it consistent with the icons present in gtk-common-themes snap

 * Backporting them to focal would greatly increase the differentiation of the file types that are existent for the average user

[Test Case]

 * open files and have a look at archive-based files (ex: gzip,7z), virtual-box based files, dart, docker files, some files use generic mimetype-icons and some scalable icons are not consistent and missing

 * install yaru from ubuntu/groovy branch and github and open files again to see the refinement to the already existing mimetype and inclusion of more mimetype-icons and scalable icons

[Other-info]

* will be followed with changes made to ubuntu/focal branch on github with this pull request: https://github.com/ubuntu/yaru/pull/2506

[Frederik Feichtmeier (feichtmeier)]

@Daniel
Anything that we've missed to get this into focal?

[Sebastien Bacher (seb128)]

@Frederik, Daniel was probably just triaging, as usual you need someone to handle the upload

[Frederik Feichtmeier (feichtmeier)]

@Seb how can we get the SRU team in here? :)
Because we have two questions.

Would it be okay if we backport a change to the mimetype edge (fold) to focal, too?
----> PR with pictures: https://github.com/ubuntu/yaru/pull/2406

Would it be okay to backport an increase in brightness of the purple of the sliders to focal?
----> PR with picture: https://github.com/ubuntu/yaru/pull/2311

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.