Improve main() and support for DISCO_L475VG_IOT01A #4
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As per the latest guidelines on Mbed OS standard pin names, all buttons are numbered, starting at `BUTTON1`. `USER_BUTTON` is not available on DISCO_L475VG_IOT01A anymore.
The majority of flash devices support reading single bytes without alignment concerns. The config `mcuboot.read-granularity` enables additional code to handle read alignment, and it comes with a slight code size and performance overhead.
Mbed OS builds .bin images by default for most targets, but many targets (e.g. ST targets running the latest ST-LINK firmware) also support .hex files, making this demo much easier to prepare. In case a target doesn't support .hex files, README.md already contains steps for merging .hex files into a single one and converting it to a .bin file.
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