WIP: Choose protocol at runtime (not in DSL).
- changed semantics of ViaTest slightly (setting same value for inputBoth does not change to newly send value as the "FromMqtt-" and "FromRest-" part is not prepended, and therefore it stays the same)
- changed semantics of ViaTest slightly (setting same value for inputBoth does not change to newly send value as the "FromMqtt-" and "FromRest-" part is not prepended, and therefore it stays the same)