Cleanup/Decoupling/Improvements

[kris-jusiak]

• move has_shared_ptr away from the singleton scope
• fix a typo in shared_factory
• heap as an extension
• allow overriding memory_traits

[codecov[bot]]

Codecov Report

Merging #297 into cpp14 will decrease coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##            cpp14     #297      +/-   ##
==========================================
- Coverage   98.51%   98.51%   -0.01%     
==========================================
  Files          80       79       -1     
  Lines        2898     2888      -10     
==========================================
- Hits         2855     2845      -10     
  Misses         43       43

Impacted Files	Coverage Δ
test/ut/type_traits/memory_traits.cpp	100% <ø> (ø)	:arrow_up:
include/boost/di/scopes/singleton.hpp	100% <ø> (ø)	:arrow_up:
include/boost/di.hpp	99.13% <ø> (-0.01%)	:arrow_down:
include/boost/di/scopes/unique.hpp	100% <ø> (ø)	:arrow_up:
test/ut/concepts/configurable.cpp	100% <ø> (ø)	:arrow_up:
include/boost/di/config.hpp	100% <ø> (ø)	:arrow_up:
test/ut/core/provider.cpp	100% <100%> (ø)	:arrow_up:
test/common/fakes/fake_config.hpp	100% <100%> (ø)	:arrow_up:
test/ut/type_traits/scope_traits.cpp	100% <100%> (ø)
test/ft/di_config.cpp	99.2% <100%> (+0.18%)	:arrow_up:
... and 5 more

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