New functions: gui.set_layout() and gui.get_layouts()

[AGulev]

Added new functions gui.set_layout() and gui.get_layouts():

local ok = gui.set_layout("Portrait")
  if not ok then
      print("Portrait layout not found in this scene")
  end

local layouts = gui.get_layouts()
for id, size in pairs(layouts) do
    print(id, size.x, size.y)
end

A new checkbox, Auto Layout Selection, has been added to Display Profiles. It disables automatic layout detection in the project:

Fix #5889

[AGulev]

When I started, I was sure that there should be a way to avoid property creation and operate directly with protobuf. But I didn't figure out how to do so. Please let me know if it can be simlified.

[vlaaad]

I think this can't be simplified; we typically assign all protobuf fields to node properties.

[AGulev]

The project contains many GUIs, and it might be hard to write a universal logic, that switches layouts without an ability to get all the layouts of the GUI component.

[britzl]

Why are all of these called something with Callback? Seems strange... Shouldn't it be ApplyLayoutFn, SetMaterialPropertyFn etc?

[AGulev]

we can't communicate gui<->gamesys another way

[AGulev]

If you mean naming: I agree it should be Fn, but I in this PR I just adapt to what we already have

[britzl]

Yep, I was only referring to naming.

[AGulev]

I can rename all the functions all over the code, ofc. but I'm not sure if we should do that as part of that PR

[vlaaad]

Editor changes look good!

[vlaaad]

I think this can't be simplified; we typically assign all protobuf fields to node properties.