4.4.0

• New boards:
  • Seeeduino Femto M0
  • Seeeduino Wio Lite MG126
  • Seeeduino Wio Terminal
  • Seeeduino XIAO
  • Seeeduino Zero
  • SparkFun SAMD51 Thing Plus
• Added initial support for Seeed SAMD core
• Updated Adafruit SAMD core to 1.5.14 (release notes)
• Updated SparkFun SAMD core to 1.7.5
• Minor bug fixes and improvements (issue #115)