BREAKING CHANGES -- Moved ANCS to its own repository

Main Changes:

• ANCS (Apple Notification Center Service) now has its own repository, Adafruit_CircuitPython_BLE_Apple_Notification_Center
• Magic Light also has its own repository, Adafruit_CircuitPython_BLE_Magic_Light
• Apple Media Service (previously unimplemented) was also moved to its own repository, Adafruit_CircuitPython_BLE_Apple_Media

Other changes:

• Repository was migrated from Travis to GitHub Actions
• Bug fixes