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>

make.mk

@@ -150,6 +150,7 @@ SRCS += \
   $(TOP)/watch-library/hardware/hpl/systick/hpl_systick.c \
   $(TOP)/watch-library/shared/driver/thermistor_driver.c \
   $(TOP)/watch-library/shared/driver/lis2dw.c \
+  $(TOP)/watch-library/shared/driver/opt3001.c \
   $(TOP)/watch-library/shared/driver/spiflash.c \
   $(TOP)/watch-library/shared/watch/watch_private_buzzer.c \
   $(TOP)/watch-library/shared/watch/watch_private_display.c \
@@ -195,6 +196,7 @@ SRCS += \
   $(TOP)/watch-library/simulator/watch/watch_private.c \
   $(TOP)/watch-library/simulator/watch/watch.c \
   $(TOP)/watch-library/shared/driver/thermistor_driver.c \
+  $(TOP)/watch-library/shared/driver/opt3001.c \
   $(TOP)/watch-library/shared/watch/watch_private_buzzer.c \
   $(TOP)/watch-library/shared/watch/watch_private_display.c \
   $(TOP)/watch-library/shared/watch/watch_utility.c \