More proj decouple of dev's environment, PDF schematics and hw/sw fixes.

KiCAD .lib files were added to the repo, hopefully they will allow to see
the schematics on KiCAD installations without my private libs.
Also added PDF versions of the schematics, always usefull for a quick look.

The I2C sw module was enabling the interrupts on its initialization routine.

Some component values were changed to reflect actual hardware. Implemented
some fixes on the bridge-ctrller-addon after assembly and testing of
prototypes.