Updated doxyfile (removed Doxygen warnings) and added newest I2C code

	- Doxyfile now generates now errors or warnings
	- Some comment format edits (Doxygen-related) were made
	- Ordering on status marking and start of TX were fixed
	- UCSTATW was changed to UCSTAT (use with non-FRAM MCUs)
	- spiBxRxSize were replaced with ucbXToRxSize variables
	- I2C config, TX, RX, and slave present testing were added
	- comm.h function prototypes were updated