Support and test value annotation for enum

[jwillemsen]

* ridlbe/c++11/templates/cli/hdr/enum.erb:
* tests/idl4/enum/client.cpp:
* tests/idl4/enum/test.idl:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (582f46a) 59.76% compared to head (a44e2c3) 59.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #351   +/-   ##
=======================================
  Coverage   59.76%   59.76%           
=======================================
  Files         588      588           
  Lines       47989    47992    +3     
  Branches     4233     4233           
=======================================
+ Hits        28681    28684    +3     
  Misses      16187    16187           
  Partials     3121     3121           

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