Integration with ggiraph

[jimjam-slam]

The plotly package doesn't, and probably cannot, support ggflags. But ggiraph can! It currently works fine with the output, but the flags aren't interactive at all.

I propose geom_flag_interactive based on geom_point_interactive. Not sure how well it'll go with package access, but we can give it a try!

https://github.com/davidgohel/ggiraph/blob/master/R/geom_point_interactive.R