Make use of C++11 ability to use "namespace A::B"

[jwillemsen]

* ridlbe/c++11/templates/cli/hdr/ami/interface_amic_object_traits.erb:
* ridlbe/c++11/templates/cli/hdr/valuebox_traits_def.erb:
* ridlbe/c++11/writers/amistubheader.rb:
* ridlbe/c++11/writers/amistubsource.rb:
* ridlbe/c++11/writers/servantheader.rb:
* ridlbe/c++11/writers/stubheader.rb:
* ridlbe/c++11/writers/stubsource.rb:

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (91f52a0) 59.72% compared to head (61906b1) 59.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #317   +/-   ##
=======================================
  Coverage   59.72%   59.72%           
=======================================
  Files         584      584           
  Lines       47788    47788           
  Branches     4206     4206           
=======================================
  Hits        28540    28540           
  Misses      16153    16153           
  Partials     3095     3095           

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