haven't verified against a scope but they "work for me" running at 24MHz at all times now for best energy use per watt before sleeping
- fixed soft I2C master set hi/lo routines - fixed bug in matrix_send not setting all LEDs from map - fix AWU interrupt not firing; requires EXTI line to be configured too even if unused - fixed wrong dividers used in system clock set function
lots of code copied over, things filled in to hopefully get the LED matrix lighting up. untested.
