Added third output

Added new output,
added filters on input (sallen-key topology)
Rooting
Small update
Up up
LAAAAAAAAST
Updated doc + started code

- Started working on code for Arduino
- Added doc for ampli-op, capacitors
Evening commit

Continued cleaning code
Merge pull request #17 from RedBullInsomnia/RGB-output

Rgb output is ready, so it can become the master branch