Functions of SD are implemented in ../common/drivers/sd.c and ../common/drivers/sd.h to be OS-independent

added SPI implementation provided by EnergyMicro , created file for implementing driver FAT on SD through SPI

now it doesn't produce a valid binary (compliation is ok but file is too big)

Signed-off-by: Theodor Stana <t.stana@cern.ch>

fixing bitmaps, for some reason bmp2rle could not open few bitmaps, opening with gimp and saving without any changes helped

Initial commit, functions to read/write registers still to be filled.