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
rename API function
refactor API
refactor and harmonize API
improve speed by copying less, add HTML escaping
update README
add HTML parser
escaping and stricter check for md destination
update documentation
rename public function
recognize link ref also at input start
initial release