etl

2dfff5b5 - Merge remote-tracking branch 'origin/master' into feature/add_circle-ci_support

Merge remote-tracking branch 'origin/master' into feature/add_circle-ci_support # Conflicts: # include/etl/cstring.h # include/etl/u16string.h # include/etl/u32string.h # include/etl/wstring.h