etl

494322e2 - Merge remote-tracking branch 'origin/feature/to_string' into development

Merge remote-tracking branch 'origin/feature/to_string' into development # Conflicts: # include/etl/format_spec.h # include/etl/private/to_string_helper.h # include/etl/to_string.h # include/etl/to_u16string.h # include/etl/to_u32string.h # include/etl/to_wstring.h # include/etl/version.h # support/Release notes.txt # test/test_to_string.cpp # test/test_to_u16string.cpp # test/test_to_u32string.cpp # test/test_to_wstring.cpp # test/vs2017/etl.vcxproj.filters