Extend bitset support and test

[jwillemsen]

* tests/idl4/bitset/foo.cpp:
* tests/idl4/bitset/foo.h:
* tests/idl4/bitset/server.cpp: Added.

* ridlbe/c++11/templates/cli/hdr/bitset.erb:
* tests/idl4/bitset/client.cpp:
* tests/idl4/bitset/run_test.pl:
* tests/idl4/bitset/test.mpc:

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 58 lines in your changes missing coverage. Please review.

Project coverage is 59.90%. Comparing base (5f0d3ff) to head (cb60e55).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/idl4/bitset/client.cpp	48.61%	29 Missing and 8 partials ⚠️
tests/idl4/bitset/server.cpp	55.31%	17 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
- Coverage   59.90%   59.90%   -0.01%     
==========================================
  Files         603      605       +2     
  Lines       48417    48560     +143     
  Branches     4277     4291      +14     
==========================================
+ Hits        29006    29091      +85     
- Misses      16235    16281      +46     
- Partials     3176     3188      +12     

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