etl

a710c77d - Merge branch 'feature/#615-addition-of-etl--expected' of https://github.com/ETLCPP/etl into feature/#615-addition-of-etl--expected

Merge branch 'feature/#615-addition-of-etl--expected' of https://github.com/ETLCPP/etl into feature/#615-addition-of-etl--expected # Conflicts: # arduino/library-arduino.json # arduino/library-arduino.properties # include/etl/expected.h # include/etl/private/variant_variadic.h # include/etl/result.h # include/etl/version.h # library.json # library.properties # support/Release notes.txt # version.txt