Version using std::filesystem

What's Changed

• ENT-12650 Use std::filesystem by default by @john-forrest in #5

Full Changelog: 0.3.3.97-tp6...0.3.3.97-idscan7

Further temp std::filesystem version

0.3.3.97.jf5

ENT-12650 Missed another use of BOOST rather than Boost

Further temp 0.3.3.97 with std::filesystem

ENT-12650 Remove conditional

This makes it more like old patch version

Temp further std::filesystem version

0.3.3.97-jf2

ENT-12650 Minor fixes to previous

Temp 0.3.3.97 with std::filesystem

EMT-12650 Further fixes

Particularly after trying USE_BOOST_FILESYSTEM=ON

0.3.3.97 with C++17 compatibility updates

Add latest C++17 change to 0.3.3.97-tp5

Temp redo 0.3.3.97-jf2

No change but previous was replacement of earlier one we deleted and confusing system

Temp 0.3.3.97 version with further C++17 fix

Need to have some more changes

C++17 compliant release

Fixed issues with non compliant code related to auto_ptr

C++17 compliant

0.3.3.97-tp4

ENT-2470: Changed auto_ptr to unique_ptr