Add Annotation mixin to add idl_stringified

[jwillemsen]

* ridlbe/c++11/config/parser.rb:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (134e6b5) 59.66% compared to head (1cee4a3) 59.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   59.66%   59.66%           
=======================================
  Files         589      589           
  Lines       47510    47510           
  Branches     4212     4210    -2     
=======================================
+ Hits        28348    28349    +1     
  Misses      16049    16049           
+ Partials     3113     3112    -1     

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