Bootloader support for Mbed OS 5.13
New features
- Build against Mbed OS 5.13.0
- Add configuration for KVStore on SPIF
- Support NUCLEO_F303RE
Improvements
- Documentation updates
- NUCLEO_F303RE Limit binary size to 36KB
- Support DISCO_L475VG_IOT01A using external QSPIF storage
- Small bugfixes