Conflicts:
README.md - Kept Adafruit README.md intact.
py/emitglue.c - Added xtensa architecture as an OR of the define.
zephyr/README.md - Fixed spelling mistake.
on a per port basis.
Also enables generating docs from inline RST in C code. Simply omits all
lines except those that start with //|. Indentation after "//| " will be
preserved.