Creation of the class statistics [Statistics]
Class that calculates statistics based on the number of steps

Signed-off-by: Omar Scotti <omar.scotti@mail.polimi.it>
Signed-off-by: Diego Rondelli <diego.rondelli@mail.polimi.it>
Deleting obsolete files [spi1_reg]

Signed-off-by: Omar Scotti <omar.scotti@mail.polimi.it>
Signed-off-by: Diego Rondelli <diego.rondelli@mail.polimi.it>