Fix for hidden characters in the input file

[adamdempsey90]

PR Summary

An artemis user found that this

<parthenon/mesh>
refinement = static\r

was parsed incorrectly (after spending half a day to find the hidden \r character).

This PR does two things:

• Adds a new unit test that exposes this bug
• Adds a fix which strips out all the nasty characters \t\r\f\v\n immediately after reading a line in the input file.

PR Checklist

• Code passes cpplint
• New features are documented.
• Adds a test for any bugs fixed. Adds tests for new features.
• Code is formatted
• Changes are summarized in CHANGELOG.md
• Change is breaking (API, behavior, ...)
  • Change is additionally added to CHANGELOG.md in the breaking section
  • PR is marked as breaking
  • Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• CI has been triggered on Darwin for performance regression tests.
• Docs build
• (@lanl.gov employees) Update copyright on changed files

[adamdempsey90]

@par-hermes format