Allow adaptive tiling in empty and favorite layouts

[gooselabz]

Closes Leleat/Tiling-Assistant#426.

Enables adaptive tiling when no windows are tiled and adds adaptive split behavior to favorite layouts, matching adaptive tiling mode.

[Leleat]

Thanks for the PR.

EGO doesn't support semantic versioning, so TA also never did and only ever used one version (build from the main branch). This looks like a behavioral change, so I am going to put this PR on the back burner and revisit it later. I don't want to change the behavior for the current users mid-GNOME-cycle. For now, I want to still create a minor/bugfix release for the current GNOME version. After that I am going to take a look at this.