Add spacing between tiled windows
See https://gitlab.gnome.org/Teams/Design/os-mockups/-/blob/master/mobile-shell/mobile-shell-convergence.png . Filing this separate from #165 since the current left/right tiling would already benefit.
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See https://gitlab.gnome.org/Teams/Design/os-mockups/-/blob/master/mobile-shell/mobile-shell-convergence.png . Filing this separate from #165 since the current left/right tiling would already benefit.