Quentin

This release adds the following improvements:

• add check for valid structure of accessory pin (XXX-XX-XXX)
• implement 2 stage pairing: support accessories with generated accessory
  pins
• clean up get_characteristics parameters to work with tado internet bridges
• add host header on HomeKit IP requests to work with tado internet bridges
• skip Accept-Encoding header when pairing IP accessories also for to work
  with tado internet bridges
• HomeAssistent already has discovery via zeroconf. We support this by
  extracting a function for parsing the HomeKit specific data