etl

7bfa2d94 - Merge branch 'development' into hotfix/#649-intrusive_list-array-bounds-test-failure

Merge branch 'development' into hotfix/#649-intrusive_list-array-bounds-test-failure # Conflicts: # include/etl/intrusive_forward_list.h # include/etl/intrusive_list.h # include/etl/optional.h # test/test_optional.cpp # test/vs2019/etl.vcxproj.filters