relax timeouts for device requests
fixed checking for features of offline 2.0 devices
disable the unpair button for peripherals of a Nano receiver
tray icon: pick the battery of the lowest _active_ device
fixed status keys in pairing
fixed request timeouts for devices
added read/write_register to receiver and devices
fixed reading encrypted link status in pairing window
better handling of timeouts in base.request
one a separate flag to check if the device is active
made the config_panel self-contained
only look for a different tray battery icon if the changed device is a peripheral
tweaked timing of enabling receiver notifications
save configuration a little early, better timing on shutdown
forgot about pairing notification on receiver...
drop some unnecessary logging when ignoring request replies
status: the device may be invalid when processing the unpair notification
be a bit more patient when pairing, the device notification may come after the pairing lock is closed
fixed reading of polling rate
fixed clean-up of config panel when unpairing devices