Merge branch 'dhylands-teensy-new'

py/mkrules.mk

stmhal/gccollect.c

stmhal/mpconfigport.h

stmhal/mphal.h

stmhal/pin.c

stmhal/pin.h

stmhal/pin_defs_stmhal.h

stmhal/pin_named_pins.c

stmhal/pybstdio.c

stmhal/pyexec.c

stmhal/readline.c

teensy/Makefile

teensy/hal_gpio.c

teensy/help.c

teensy/import.c

teensy/lcd.c

teensy/led.c

teensy/led.h

teensy/lexerfatfs.c

teensy/lexermemzip.c