A few smaller changes

A few smaller changes

 * Bugfix in fancontrol, keep it from sending a source which weirds out
   zigbee2mqtt
 * Bugfix in reprocess, don't modify the expire map at the same time as
   you're updating it from received messages (mutex)
 * Feature addition in lights - dummy mode, to just process updates but
   not take action on them (i.e. controlling lights)
 * Feature addition in reprocess, allowing it to read pm25 sensor data
   (DIY devices) and door sensor updates (off the shelf)