REQUEST: Add collapsable groups to the lua gui api

[UchihaPhantom]

Being able to group the module's UI into collapsable sections like the one in the Simulator configuration would be highly benefitial to the UX of the UI of many modules.

[OpenFunscripter]

I think those are easy to add.

function gui()
  if ofs.CollapsingHeader("abc") then
     ofs.Text("This text is only visible when the header is shown")
  end
end

[OpenFunscripter]

Ugh me using "fix" in the commit message auto closed the issue. But it's added now