• add \fnpct_unspace: (similar/equal to biblatex's \unspace); removes spaces before \footnote; also see https://tex.stackexchange.com/q/467561/
• new option mult-variant-prefix
• new option unspace

New implementation

• support footnote ranges when possible
• support more packages
• more flexible way to adapt unknown note commands with less commands
• drop support of \innernote (maybe re-implement it in future versions, depending on user feedback)
• partially drop \multfootnote and friends