Aperture priority light meter face (#230)

* initial commit, added opt3001 light meter test app

* tested working light meter board, i2c communication still has issues

* fixed i2c; rudimentary lightmeter works!

* added aperture priority ui

* added aperture priority ui

* added README

* adjusted cal

* fixed bugs (HI shutter speed, lux mode toggle)

* made it possible to advance to the next face

* initialized lux variable

* lowered tolerance for HI and LO

* Changed EV display from always showing EV100 to showing EV[iso setting]

* dont display old ev when ISO changes

* changed mode and light behavior

* updated readme

* fixed indentation

* made lightmeter display logic more consistent

* made lightmeter display logic more consistent

* reverted rules.mk (for merge into upstream)

* reverted rules.mk (for merge into upstream)

* removed OPT3001 PCB model

* made lux mode default, corrected timeout behavior

---------

Co-authored-by: Christian Chapman <user@debian>

movement/make/Makefile

@@ -101,6 +101,7 @@ SRCS += \
   ../watch_faces/complication/activity_face.c \
   ../watch_faces/demo/chirpy_demo_face.c \
   ../watch_faces/complication/ships_bell_face.c \
+  ../watch_faces/sensor/lightmeter_face.c \
   ../watch_faces/complication/discgolf_face.c \
   ../watch_faces/complication/habit_face.c \
   ../watch_faces/complication/breathing_face.c \