Added "Randomize Marker Color" option from #2210

[Azagwen]

This pull adds a "random marker color" option in the outliner context menu, which will pick a random color (different from the current one) and apply it to any selected element

demo video:

electron_dMGeebxFbF.mp4

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[JannisX11]

A few things to improve:

• Let's implement this as a standalone Action instead of a menu item. That way users can add it to their toolbars and assign keybindings. Actions can be added back to menus by adding their ID as a string
• Let's change the name to "Randomize Marker Colors". That way the action is more clear, and the plural clarifies that each element gets its own color
• Let's change the icon to "fa-shuffle"
• I haven't fully made up my mind about it, but it might be neat to move this action directly into the Marker Color submenu, below the other points. That way the main menu is less cluttered. But lmk your thoughts.

[Azagwen]

Will do these changes when I find the time 👍