Using phsstyles without the need to load phsstyles

[Nic-Chr]

Hi, some functions are not working unless phsstyles is loaded, e.g. via library(). This is problematic for developers that wish to import phsstyles into their own package or simply use the functions without needing to load the package.

I notice that this issue has been raised before here: #1

Below is an example of how this problem manifests.

library(tidyverse)
iris |> 
  ggplot(aes(x = Sepal.Length, y = Sepal.Width)) + 
  geom_point(aes(col = Species)) + 
  phsstyles::scale_colour_discrete_phs()
#> Error in name %in% phs_palette_types[["seq"]]: object 'phs_palette_types' not found
  library(phsstyles)
iris |> 
  ggplot(aes(x = Sepal.Length, y = Sepal.Width)) + 
  geom_point(aes(col = Species)) + 
  phsstyles::scale_colour_discrete_phs()

^{Created on 2024-05-13 with reprex v2.0.2}

[Nic-Chr]

I have written up a working fix to address this issue and I'd be happy to open a pull request.