Features to make caterpillar plot more equivalent to orchaRd plot

[befriendabacterium]

Is your feature request related to a problem? Please describe. I really like that orchaRd also has a caterpillars() function to plot this alternative way of displaying the same information, but going further with this by adding some options to colour the caterpillar plot by study and change the orientation (so effect size is on y axis) would a nice feature to facilitate closer comparison.

Describe the solution you'd like

1. Option to colour by study as in orchard_plot()
2. Option to flip orientation of plot as in orchard_plot()

Describe alternatives you've considered Could manually recolour and reorientate the orchard plot object I suppose but can be tricky esp. with re-colouring as the syntax required is a bit different.

[befriendabacterium]

Here's my proposed colouring-by-study feature addition https://github.com/daniel1noble/orchaRd/pull/43

[befriendabacterium]

And when/if you've merged that, here's my proposed flipping orientation solution.

https://github.com/daniel1noble/orchaRd/pull/44

[daniel1noble]

Merged now