Test ScriptManager using X11 forwarding

[owlang]

We need to confirm that ScriptManager works with X11 forwarding on remote servers. If it doesn't we should look into why and assess if it's reasonable to add support for this.

[owlang]

@FredFazan has tested and confirmed that is working, although the GUI look and feel is a bit off with a dark background. This should be using MetalLAF which is supposed to be kind of hardcoded and robust to different systems. A possible fix is to update the LAF with a custom design (a backburner project that could be reprioritized).