rename example and add example that does only logging
rename notes
lots of optimisations

- remove throttling
- improve resetting of calibration
- don't remember flying state through events sent (will use nav data in
  the future)
allow registering of the drone client
read the flying state from the drone
add example navdata
fix up/down control
hover if there is no hand
give low battery warning and display battery information at the start
add throttled logging
add punch animation
add animation types
rename normalisePP to normaliseCm