Update to VideoIO.jl

* Use new BinDeps features like library groups

* Update build incantations for new versions/platforms

* Remove all postproc stuff

* update REQUIRES

This builds and loads on my mac, but the tests fail because it can't grab a certain file from archive.org.  This PR is a little cavalier in how it throws stuff out, so feel free to iterate with me here to get it to be what you want.
@Keno for some reason, `@BinDeps.load_dependencies` is not working properly here.  It deletes `deps/deps.jl` and replaces it with something that doesn't contain any of the libraries it finds normally from a `Pkg.build()`.  Any ideas?