Improved ZCL attribute reading for sensors
Improved ZCL attribute reading for sensors

- query group identifiers only from devices with ZLL commissioning cluster
- don't read SWBuildID from sensors since its only available in ZLL devices
- clear READ* flags as soon as values are received
- add reading of manufacturer name and model id for sensors

dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin