Skip TeX comments correctly. mathjax/MathJax#2271.#413

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dpvc wants to merge 2 commits intodevelopfrom issue2271

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Commits on Dec 26, 2019

Update FindTeX to properly skip comments, even if they include unbalanced braces. Resolves issue mathjax/MathJax#2271
dpvc
committed

Commits on Dec 31, 2019

Simplify how comments are handled.
dpvc
committed