Allow for opening in a separate floating window

[je-sendra]

Problem statement

It is fairly more comfortable to have the design (2D/3D) views of your project on one screen and things like scripts or the LimboAI tab in another screen. This is not easily doable right now.

Proposed solution

Put a floating window button that opens the LimboAI editor in a separate OS window, like the scripts tab has.

Alternatives

I guess worst case scenario is you need to open 2 instances of Godot to put the LimboAI tab in another screen.

[limbonaut]

You can put LimboAI into a separate window, but Inspector will stay with the main window, which isn't a great experience IMO, as inspector is a huge part of LimboAI workflow.