Added support for all variants of Sanguino

I have created a git repository with support for all variants of Sanguino:
* ATmega644
* ATmega644A
* ATmega644P
* ATmega644PA
* ATmega1284
* ATmega1284P

Both 16MHz and 8MHz versions are supported.

My repo can be found here: <https://github.com/Lauszus/Sanguino>.