macOS Dock Menu support

[LenaWil]

Implements support for macOS Dock Menus.

Original text:
A terrible two liner that I didn’t put through the linter to show that support for Dock Menu’s would be easy to implement.

I should probably improve it, but I first wanted to know if the devs are open to this at all before I actually spend time on this.

Closes #4156.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[flavioislima]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[LenaWil]

I have read the CLA Document and I hereby sign the CLA

[LenaWil]

The linting is failing because of http errors, not actual errors. Can someone rerun it when the servers are up again?

[LenaWil]

Repeating something I said on Discord:
Also I could make a separate menu for the Dock with the stop/quit option hidden, that would mean generating the menu twice though.

[CommandMC]

Adding this image posted on Discord to make it easier to picture how this looks for people on non-macOS:

[CommandMC]

Can't test this, but looks and sounds fine to me