The encoding of endDeviceAsset in eiEventSignal appears to contradict the schema

See also https://sourceforge.net/p/openadr2vtn/wiki/Home/#f052

We found some fixes regarding endDeviceAsset in this fork https://github.com/dupes/nebland-oadr-vtn
https://github.com/dupes/nebland-oadr-vtn/commit/9d0b67b488ee754f0c1ca53d64d884e5db22cc39
https://github.com/dupes/nebland-oadr-vtn/commit/42df0941b3d10786c0956c5cf21510a0bfdbf029