Reformat serial debug messages
Cleanup
Changed buffer to uint16 as default mode is YUV422

Color values for one color pixel is presented in two consecutive uint16. Least
significant bits of every uint16 represents the luminance (brightness/grayscale)
of the pixel.
Print whole image as hex to serial
Capture continuously and print DCMI data register on loop to serial => One pixel camera
Enable DCMI frame capture and DMA transfer complete interrupts
Changed line endings to unix style and removed trailing spaces