Doc updates for HID++ 1.0 notifications

This updates the hid1.0.py file and makes stronger assertions about the structure and meaning of flags. Still guesswork, but I am pretty confident with it.

See also:
- https://git.lekensteyn.nl/ltunify/tree/registers.txt (keyboard flags in general)
- https://git.lekensteyn.nl/ltunify/tree/keyboard.txt (multimedia and sleep buttons)