etl

afabc049 - Merge branch 'master' into feature/variadic-variant

Merge branch 'master' into feature/variadic-variant # Conflicts: # include/etl/mem_cast.h # test/test_mem_cast.cpp # test/test_mem_cast_ptr.cpp # test/vs2019/etl.vcxproj # test/vs2019/etl.vcxproj.filters