This updates Cortex-M3 port files to version found in
V10.3.1-kernel-only tag of FreeRTOS-Kernel.
The new upstream release includes memory barriers which are essential
for use with modern optimising compilers. Without those firmware
certainly breaks with -O3 -flto and might be also broken with other
optimisation configurations.
Fixes: d59ec10c4e ("Update FreeRTOS to v10.3.1")
Settings menu works
Movement working & TMP calibrated
Tip reading sensibily
Accuracy seems ok
Trimmed down overshoot by biasing integral
Saving to flash working, detailed idle
Sleep mode
Description scrolls
Building for DFU working
Motion detection update
Use manual alg instead, using highpass filter, then sum current change vs rolling average
Re-shuffle the pwm code organisation
