fix/improve some comments, group add and remove functions #1054
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I changed the comment of set_lookup_path dramatically to be aligned with the comment on the C function lookup_path, as it was a lot more descriptive. However, I used the @ parameters more heavily to split it up into sections.after discussion with Sander, he instead suggested to use @see so there's no comment duplication across CPP/C API so @see has been added to set_lookup_path cpp function
I relocated the add enum function to be grouped with the other add functions. Same with Remove.
The rest is quite minor.