Add option to copy a file's name in the FileSystem dock

[YeldhamDev]

Sponsored By: 🐺 Lone Wolf Technology / 🍀 W4 Games.

[AThousandShips]

Haven't tested but code looks good

[KoBeWi]

Looks like niche option. You can copy path and delete everything besides the name (it takes 1-2 seconds). IMO it's not frequent enough operation to warrant bloating the menu. Most of the time you need the whole path.

[fire]

I agree that bloating the menu is probably not worth the tradeoff. Maybe @YeldhamDev can make a convincing case to add this.

[timothyqiu]

Maybe "Copy Filename"?

Copy Name brings me the question of whether it copies icon or icon.png.

[Flynsarmy]

With this context menu getting longer (and it'll probably get longer again in the future when we introduce refactoring features) it might be best to put all the copy string functions into a sub menu.

That is if we even think this feature should be in core. It seems pretty niche and you can already hit F2 and copy which is just as fast.

[KoBeWi]

btw we have new EditorContextMenuPlugin that allows implementing this feature with an addon.

[Arnklit]

Would resolve godotengine/godot-proposals#10173
Note: I suggested in that Proposal that you toggle the option with Alt similar to how MacOS does it in some right click menus, this would allow it to not bloat the menu length, but I don't know if this is a UI pattern we want to adopt in Godot.