Cleanup for Aduino code

- Reduced memory buffer by 64 bytes for ATTiny
- Removed unused stuff
- Added struct for getting routing info
- Added address of pipe, to get direct child addresses
- Removed type limitation on header initialization
- Fix to allow multicast level 0 (node 00)
- Need to align changed with RPi
Add conversion

- Added routing/address conversion separate from write function
- Remove BS copyright info: This was never discussed or agreed to. This
is completely free and open software. If you want to copyright things,
do it elsewhere.
Merge remote-tracking branch 'origin/TMRh20' into Development