Bridge Ctrller sw: Added support for EEPROM stored configuration
and increased the AVR clock to 8MHz.

Many comments added to explain and provide the register options.
Started migration to avrdude instead of my proprietary atburner
tool and cleaned-up the Makefile a little more.
Implemented motor current measurement method of waiting for the right
time to start the ADC.

Gives some results but it's not yet very reliable.
Also more makefile cleanup.
Bridge Ctrller sw: Added current control, adjusted dead times and many
code space optimizations.