added a api to manage the power supplies of peripheral power supplies and level shifters
address coding style concerns of some individuals
[NUCLEO_F302R8] Add I2C slave, enhance I2C master
Added TARGET_LPC11U68 to timer/ticker/eeprom tests
Code indentation only
typo
K20D5(0)M SPI code

Other pinouts still need to be done. PTC6 as MOSI possibly has issues.
There are also some changes which technically aren't required, but were
made in the search to why on earth it wasn't doing anything.
[NUCLEO_F030R8] enhance I2C master
[NUCLEO_F302R8] indentation correction in I2C api