to remove variations, redundancies, add missing, fix errors. All c files
refer only to the dispatch style headers in /include/stm32. Those headers
#include memorymap.h and cm3/common.h. All references to
these are removed from the family specific headers. Ethernet untouched as
it appears incomplete.
Added dummy spi.c for F0/F3. Fix some doxygen anomalies.
Very few functions can be shared (~ 3). A possible solutions is to move
i2c_common_all to i2c_common_f124, create i2c_common_all and move f3/i2c to i2c_common_f3. Who agrees?
