fixed footnote parsing error for haroopad
fixed numeric footnote issues
add hr tag for split footnote in the body
fixed strikethrough syntax conflict with subscript
fixed footnote link position error
Merge branch 'feature/footnotes'

* feature/footnotes:
  fixed footnote link position error
  fixed strikethrough syntax conflict with subscript
  add hr tag for split footnote in the body
  fixed numeric footnote issues
  fixed footnote parsing error for haroopad