update markup_text_boxst

[ab9rf]

this PR is based on bay12 header files and addresses issues raised in #569 and #574

[ab9rf]

wrong base branch, sorry

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[Bumber64]

Should we maintain the init-values for markup_text_wordst? Those are set in a constructor function. Same for markup_text_linkst's id and subid, unless those default to -1 automatically. (Was going to update the comments on these, so I can do this in a separate PR, since this one's ready to merge.)

Is it possible to do a refers-to on link_index such that gui/gm-editor can jump to the ref, or does that only work when something's global? Just going to assume "no, because pointers."

[ab9rf]

i'll add the init-values, i missed them working from toady's source because he uses a constructor function to set them instead of specifying them as defaults (as a note: you are free to use github's code review mechanism to suggest changes to a pending PR, that's why we use PRs)

the problem with making link-index jumpable in gm-editor is that the logic to figure out what to jump to is probably more complicated than gm-editor is currently capable of understanding

[Bumber64]

Some comments on the purpose of some fields.

[Bumber64]

You left in the "subid: " part of the subid comment and left out the ending ')' for py.