Avoid a Rustc bug

remove abandoned crate

add Wikitext parser

upgrade Nom dependency to v7.0.0

split crate

Keep hyperlink related parsers in `parse-hyperlinks` and outsource
HTML image parser to `parse-hyperlinks-html`. The latter are
needed by `tp-note`.

no `<pre>` in `--only-links` output

add HTML only parsers and iterators

upgrade dependencies

parse simple rst-label followed by punctuation

Bug fix: render also text without links

implement iterator, resolve link references

extend adoc parser `Text2Dest`

add two more adoc link parser

add parser variant

add .rst `TextLabel2Dest` parser

`take_link()` informs about the skipped bytes

add more public functions