Add initial CHM13 support to template

[edmundmiller]

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Closes #1988

[codecov]

Codecov Report

Merging #1990 (9dcb778) into dev (6bf8f30) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1990   +/-   ##
=======================================
  Coverage   62.01%   62.01%           
=======================================
  Files          42       42           
  Lines        4862     4862           
=======================================
  Hits         3015     3015           
  Misses       1847     1847           

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[mirpedrol]

LGTM :)
sorry for the late review, there will be some changelog conflicts but should be easy to fix