WebcamInput: RGB instead of RGBA

[fonsp]

Make WebcamInput output a Matrix{RGB} instead of Matrix{RGBA}, because:

• I found that this is easier to work with, more common in the Julia ecosystem (e.g. DitherPunk.jl supports RGB images, but not RGBA. PlutoUI.ColorPicker gives a RGB) and easier to understand
• It saves 25% of data being sent over the wire

This is technically breaking, but shhhhhhhh 🤫 thats a little secret. I did not really announce WebcamInput yet, and it has only been out for a day. Many scripts that used the old code will still work, unless they accessed the .a attribute. I think the advantages outweigh the worries about breaking something, so I am going for it.

[github-actions[bot]]

Try this Pull Request!

Open Julia and type:

  julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/JuliaPluto/PlutoUI.jl", rev="webcaminput-rgb-rgba")
julia> using PlutoUI

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