Enable detection of unknown device classes and unknown properties

[banban525]

ECHONETLite2MQTT did not detect device classes without definition files or undefined properties. However, some devices have device classes or properties that are not in the standard. Although it is not possible to decode HEX data because it is an unknown data type, it is possible to display HEX data as is and send data as HEX. This is useful for analyzing uniquely extended devices and properties.

For compatibility, the following options will continue to treat unknown classes and unknown properties as errors:

• [docker] -e ECHONET_UNKNOWN_AS_ERROR=1
• [node.js] --echonetUnknownAsError 1

[banban525]

This feature was implemented in v3.0.0.