Two new command-line options are added:
`--lof[=true|false]`, `--list-of-figures[=true|false]`
`--lot[=true|false]`, `--list-of-tables[=true|false]`
Only docx, latex, and context are supported at this point.
Setting the `lof` and `lot` variables will also work for the formats that are
currently supported.
[API changes]
+ Lua: `list_of_figures` and `list_of_tables` can now be used in writer options.
+ Text.Pandoc.Options: add `writerListOfFigures` and `writerListOfTables` fields
to `WriterOptions`.
+ Text.Pandoc.App.Opt: add `optListOfFigures` and `optListOfTables` to `Opt`.
Closes#8245.
Co-authored-by: John MacFarlane <jgm@berkeley.edu>
