Deprecate custom make_unique in favor of std::make_unique

[jslee02]

As we migrated to C++14, the custom make_unique is deprecated in favor of std::make_unique.

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[codecov]

Codecov Report

Merging #1317 into master will decrease coverage by <.01%.
The diff coverage is 55.31%.

@@            Coverage Diff             @@
##           master    #1317      +/-   ##
==========================================
- Coverage   57.13%   57.13%   -0.01%     
==========================================
  Files         366      366              
  Lines       27052    27050       -2     
==========================================
- Hits        15457    15455       -2     
  Misses      11595    11595

Impacted Files	Coverage Δ
dart/dynamics/ReferentialSkeleton.cpp	40.66% <ø> (ø)	⬆️
dart/common/detail/Factory-impl.hpp	100% <ø> (ø)	⬆️
dart/common/detail/Memory-impl.hpp	100% <ø> (ø)	⬆️
dart/dynamics/SharedLibraryIkFast.cpp	51.13% <0%> (ø)	⬆️
dart/common/AspectWithVersion.hpp	42.85% <0%> (ø)	⬆️
dart/dynamics/Skeleton.cpp	66.12% <0%> (ø)	⬆️
dart/common/detail/ProxyAspect.hpp	64.7% <0%> (ø)	⬆️
dart/dynamics/InverseKinematics.cpp	49.46% <0%> (ø)	⬆️
dart/dynamics/detail/CompositeNode.hpp	50% <100%> (ø)	⬆️
dart/common/EmbeddedAspect.hpp	95.34% <100%> (ø)	⬆️
... and 14 more