Add "open in editor" button to screens in the following format

[KaaayKaay]

Idea

Add the "Open in editor" button to the following screen format shown below + allow placeholders

Use case

A text input field linked to the variable "colour" where the user can type in the HEX code of the colour theme they want for the modpack UI

That same variable would be used in the "rectangle shape" element's colour property as show below

Extra info

Would work very well with the ability to change hue as shown in #873

[Keksuccino]

It's not as easy as "adding a button". Every element internally needs to support upating their values to update placeholders. I would need to constantly update colors to make placeholders work and I decided not to do that when coding v3.

[Keksuccino]

Every placeholder update eats performance. I optimized that process in v3, but it's still a heavy task.

[KaaayKaay]

Every placeholder update eats performance. I optimized that process in v3, but it's still a heavy task.

Fair, I have noticed some performance issues with placeholders, tickers and variables so I can understand.

Maybe consider for advanced mode