`rowsize!` and `colsize!` for nested layouts

If fig_or_sub is a Figure, you could place the GridLayout at position [1, 1], otherwise you place it at fig_or_sub[] which just means at that position.

function show!(fig_or_sub, rel_heigth)    
    gl = if fig_or_sub isa Figure
        fig_or_sub[1, 1] = GridLayout()
    else
        fig_or_sub[] = GridLayout()
    end
    image(gl[1,1], rand(10,10))
    plot(gl[2,1],sin.(1:0.1:10), color=:red)
    rowsize!(gl,2,Auto(rel_heigth)) 
end

##

fig = Figure()
show!(fig[1,1], 1)
show!(fig[1,2], 2)
fig


##

fig = Figure()
show!(fig, 2)
fig
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