tidyplots 0.2.2

This is a patch release mainly focusing on preparing tidyplots for the upcoming release of ggplot2 3.6.0.

Breaking changes

• Hard deprecation of as_tidyplot(). Converting a ggplot to a tidyplot probably never was a good idea.

Improvements

• Support ordered factors provided to color (#75)
• Prepare tidyplots for upcoming ggplot2 3.6.0 release (#60)
• Switch from the magrittr pipe %>% to the base R pipe |> in both the documentation and code (#55, #56)
• More meaningful error for invalid plotmath expressions.
• Update documentation (@mthulin, #62)