Add bitmask destructor

[jwillemsen]

* ridlbe/c++11/templates/cli/hdr/bitmask.erb:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.84%. Comparing base (cfe7abc) to head (d47b842).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
- Coverage   59.85%   59.84%   -0.01%     
==========================================
  Files         602      602              
  Lines       48393    48393              
  Branches     4278     4281       +3     
==========================================
- Hits        28964    28963       -1     
  Misses      16258    16258              
- Partials     3171     3172       +1     

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