MX25R6435F library v2.0.0

• Add usage of the OctoSPI Flash memories interface. Required STM32 core version 2.0.0
• Add capabilities to redefine default pins
• Code factorization
• Clean up code
• Handle backward compatibility with the STM32 core

MX25R6435F library v1.0.2

Fix invalid keywords.txt. See #2 thanks @per1234

MX25R6435F library v1.0.1

No code update.
Only prefix library name with 'STM32duino'

First release

3 examples provided to use this library with:

• B-L475E-IOT01A : STM32L4 Discovery kit IoT node, low-power wireless, BLE, NFC, SubGHz, Wi-Fi