InfiniTime 1.2.0 "Blue-purple Elderberry" : BMA425, Metronome, memory optimizations,...

I wasn't planning on releasing InfiniTime 1.2.0 so soon, as many interesting features are in the work right now. But, as we announced in Pine64 monthly update, the factory cannot source the accelerometer (BMA421) anymore. As an alternative, they propose to use the BMA425 instead. This new sensor is very similar (it actually support more built-in features) but needed a few minor modifications to the driver (we need to take into account the new chip ID of the BMA425, for example). As the factory is waiting for a version of InfiniTime that supports the BMA425, I decided to release the version as it is as soon as possible.

So, in addition to the added support for the BMA425, this new version brings 1 new app, many improvements and bugfixes!

The Metronome app was contributed by Bryton Hall. It uses the vibrator to give the tempo to the user, and provides a nice user interface to select the beats per minute (BPM) and beats per bar (BPB, for creating an accent beat).

The Stopwatch app was also improved by Riku Isokoski. It now provides a cleaner user interface.

This release also includes many "behind the scene" developments mostly focused on memory usage optimizations. I did a detailed analysis of RAM and Flash memory usage and I've already implemented a few changes that reduce the size of the firmware (from ~420KB to ~340KB) and to reduce the RAM memory usage.

We've also fixed a few bugs (like this strange memory corruption issue on which I spent far more time than expected) and implemented a few improvements and code cleanings.