handle a few more LaTeX specific issues
handle a few more LaTeX specific issues

* explain the highlighted issue
* escape the highlighted element (helps with . or \ being included as a highlighted element)
* complain about trailing whitespace

latex style issues:
* lines should have at max one sentence
* each sentence should be contained on one line
* all \item entries should not have a period

lungetech/proposal-tools,lungetech/proposal-tools