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Added options to colour effect sizes in caterpillars() by study, defaulting to color-blind friendly palette. ('colour' and 'cb' parameters). I used essentially the 'colour' parameter as in orchard_plot for equivalency but it might be a little confusing given the other colour parameters also in the function. But maybe not. Feel free to rename if you want. Cb also works essentially the same as in orchard_plot.
I wanted to stick to one plotting function but found it tricky to find a solution in ggplot syntax that worked for both no colouring (well, yellow estimates, green errors) and colouring by study. Perhaps something to consider for a future improvement but does the job for now.