Cleanup and simplify CDR code for bitmask

[jwillemsen]

* ridlbe/c++11/templates/cli/src/bitmask_cdr.erb:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.88%. Comparing base (77a9c74) to head (733a2bc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #403   +/-   ##
=======================================
  Coverage   59.88%   59.88%           
=======================================
  Files         600      600           
  Lines       48204    48204           
  Branches     4255     4255           
=======================================
  Hits        28867    28867           
  Misses      16191    16191           
  Partials     3146     3146           

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