Virmata rohkost

Hi devvvvs!
The Firmata plugin is ported to raw + some features like full use of all pins and generic pin mode settings are implemented and tested as far as possible. Also i had the chance to test the i2c decoding. Changes in the plugin are reflected in the module and the matching help patch.
The old nodes are versioned Legacy and also marked as such in the diffff.xml. I hope got that one right!? In my builds they do not show up, as expected.

Happy to fix any mis-use or in-compliance!

greetz!