Added play, pause, reboot and stop icons

[lorumic]

Done

In the context of having icons for instance management (LXD-UI, Anbox Cloud dashboard...), this PR adds 4 new icons approved by design to the "Additional" icon set.

QA

• Open the Icons / Additional example
• Check the 4 new icons in their light and dark variants
• Review updated documentation:
  • Additional Icons

Check if PR is ready for release

If this PR contains Vanilla SCSS code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention:
  • if CSS class names are not changed it can be bugfix relesase (x.x.X)
  • if CSS class names are changed/added/removed it should be minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) should be listed on the what's new page.

[webteam-app]

Demo starting at https://vanilla-framework-4710.demos.haus

[edlerd]

LGTM, but am not too familiar with all the constraints for vanilla. Can someone more familiar with it have a 2nd eye on this one?

[lyubomir-popov]

why the duplicates?

[lorumic]

why the duplicates?

The power-off/power-error duplicate was already there. I saw it and thought it was fine to have a duplicate for reboot/restart as well. If instead this is judged to be wrong, I can remove either of the reboot/restart icons and keep just one of them - the old one, probably, should be kept.

For the other duplicate, feel free to file an issue as I feel it's out of the scope of this PR, but I can remove also that one if someone instructs me about which one should be kept - this has potential implications, there might be apps relying on either of them and we would break them by removing one now.

[lyubomir-popov]

We shouldn't be adding icons if they already exist. From the screenshot, seems both power and reboot already exist.
Can we have the 4 icons next to each other? At a quick glance, I couldnt find the play/pause stop icons

[lorumic]

We shouldn't be adding icons if they already exist. From the screenshot, seems both power and reboot already exist. Can we have the 4 icons next to each other? At a quick glance, I couldnt find the play/pause stop icons

The "power" icon is different. And not really relevant to the icons added by this PR - both in terms of visual appearance and in terms of function, probably. The 4 icons next to each other are attached to this JIRA task which is currently blocked by this PR.

[lorumic]

Removed the reboot icon.

[bartaz]

Great, thanks!