Add initial support for specifying a bit_bound for a bit_mask

[jwillemsen]

* tests/idl4/illegal_idl/bitmask_bitbound_missingvalue.idl:
* tests/idl4/illegal_idl/bitmask_bitbound_zero.idl:
* tests/idl4/illegal_idl/bitmask_nobitfields.idl:
  Added.

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

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (81ff533) 59.69% compared to head (a22bcb8) 59.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #301   +/-   ##
=======================================
  Coverage   59.69%   59.69%           
=======================================
  Files         579      579           
  Lines       47580    47582    +2     
  Branches     4198     4198           
=======================================
+ Hits        28404    28406    +2     
  Misses      16089    16089           
  Partials     3087     3087           

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

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