create magic comment for persistent macro character recognition, "wmllint: who"

The "recognize" magic comment only covers one scenario; but what about macros that are used in many scenarios?

This new magic comment creates dictionary pairs of macros with the characters they are associated with. If this is not yet clear, hopefully the following commits will show the full picture.
recognize characters from "wmllint: who" macros and append to present

Now that we see how the whopairs are recognized, we can see that the magic comment accepts a comma-separated list, for macros that deal with more than one character.

We also see that if it is necessary to remove a character who leaves the party, this can be done with another entry prefixed by double minuses.
magic comment to remove items from whopairs dictionary

If no more scenarios will be using a macro, you can remove it from the dictionary with "unwho".
add explanation about how to use "wmllint: who" magic comments to introduction
Legend_of_Wesmere: convert main characters and key loyals of LoW to 'wmllint: who' system

Also, get rid of now-unnecessary 'recognize' magic comments
Liberty utils.cfg: typo fix: born -> borne