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Attempt 2: adjust for S7 in ggplot2
This has the same goal as, and replaces, #429.
This PR simply copies the gg class operators for the S7 ggplot2::gg class.
Closing this in favour of more defensive strategies in ggplot2
I was a bit too optimistic, it turns out these methods are needed for 25 packages.
Failures seem to be due to old R versions or old CI and not necessarily related to this PR.
Thanks