Some initial support for bitset/bitfield

[jwillemsen]

* ridlbe/c++11/templates/cli/hdr/bitset.erb:
* ridlbe/c++11/visitors/bitset.rb:
* tests/idl4/illegal_idl/bitfield_65.idl:
* tests/idl4/illegal_idl/bitfield_negative.idl:
* tests/idl4/illegal_idl/bitfield_zero.idl:
  Added.

* ridlbe/base/writerbase.rb:
* ridlbe/c++11/config/cxx_type.rb:
* ridlbe/c++11/writers/stubheader.rb:
* tests/idl4/bitset/client.cpp:
* tests/idl4/bitset/test.idl:

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0d53c0c) 59.69% compared to head (c5f2705) 59.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   59.69%   59.70%           
=======================================
  Files         579      579           
  Lines       47578    47579    +1     
  Branches     4198     4198           
=======================================
+ Hits        28402    28406    +4     
+ Misses      16089    16087    -2     
+ Partials     3087     3086    -1     

Files Changed	Coverage Δ
tests/idl4/bitset/client.cpp	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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