Clarify when non-Devices can have States.
Situation: The definition of State is "The state of a device that is […]". However not only devices have states. For example, a door can be open or closed.
Proposal: change the definition of State to: "The state of a device or a feature of interest that is […]"
Status: discussed during SmartM2M-3rd RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-05-09.