Make sure the parsers array is cleared for tex and text parsers. (#1474)

[dpvc]

This PR moves the popParser() call in the mml() function of the TeXParser object so that it will be performed even when the function exits early. It also adds parseOptions.clear() to the TeX input jax reset() function, as well as the TextMacros preprocessor, just like is done in the TeX input jax compile() function.

Resolves issue #1474.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.47%. Comparing base (a65456c) to head (7e7fa55).

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #1502     +/-   ##
==========================================
  Coverage    86.47%   86.47%             
==========================================
  Files          340      340             
  Lines        86125    86127      +2     
  Branches      3206     4848   +1642     
==========================================
+ Hits         74476    74478      +2     
+ Misses       11649    11628     -21     
- Partials         0       21     +21     

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