The selected style's Page Number and Between Entry and Number rows get a
character style menu ([None] first), and a Sort Entries in Alphabetical
Order checkbox. toc.entries previews entries sorted as they will be set.
ROADMAP and the parity doc name the new options.
Each included style gets pageNumberStyle, separatorStyle and sort.
toc.generate and toc.update apply the character styles to the page
number and the separator of every entry, and list the entries of a
sorted style alphabetically among their siblings, each with the
lower-level entries under it. Unknown character styles are errors.
Renaming or deleting a character style updates the definition. IDML
reads and writes PageNumberStyle, SeparatorStyle and Sort.