Add HTML entity replacements for tab and space characters#7

LaurentAerens wants to merge 3 commits intodmsnell:maindmsnell/diff-match-patch:mainfrom

LaurentAerens:fix/c-sharp-leading-and-trailing-spaces-and-tabsLaurentAerens/diff-match-patch:fix/c-sharp-leading-and-trailing-spaces-and-tabsCopy head branch name to clipboard