MegaCoreX v1.0.10

Changelog:

• Improved Event library that makes it more versatile than before
• Fix analogRead issue for 32-pin parts (#128)
• Fix issue where fuses weren't sent when uploading to a Nano Every or a Nano 4808 (#130)
• Add GCC printf formatting checks at compile time
• Add EEPROM retain tools menu option
• Add pinConfigure function
  • Provides more flexibility when configuring a pin
  • Documented in the Extended API document
• Add "fastboot" support to Optiboot
  • Unlike before, Optiboot now starts to run the application immediately if receiving a power-on reset, just like every Official Arduino that uses a bootloader.
• Add -mrelax compiler flag for better code optimization at compile time (#141)