Major change to separate each funcionality from AVR.MCU package, into minor configurable packages. For now only valid to ATmega2560.
This change is not needed.
Package renames.
Change package names.
Comenting and indenting.
Memory_Map_ to Reg_ and minor changes.
Minor changes in formatting.
Include changes into ATmega328P.
Adapt USART example to the new adaino memory map architecture.