Merge develop into main (#161)

- Fix CoreS3 boot failure (I2C now returns bool instead of err_result_t)
- Flashing scripts now erase before flashing (to ensure it's a clean install)
- M5Stack Core2 and CoreS3: Experimental SPI speed increase

Buildscripts/Flashing/flash.ps1

@@ -13,6 +13,8 @@ $jsonClean = $json.flash_files -replace '[\{\}\@\;]', ''
 $jsonClean = $jsonClean -replace '[\=]', ' '
 
 cd Binaries
+$command = "esptool --port $port erase_flash"
+Invoke-Expression $command
 $command = "esptool --port $port -b 460800 write_flash $jsonClean"
 Invoke-Expression $command
 cd ..