Average data usage widget

Aug 25, 2021

---Note: if the widget stops responding, just restart the device or delete and then add the widget again.----

V 3.0
- Configurable period length (any number of days or months).
- New tweak: advanced secondary bars
- Improved settings screen

IMPORTANT! This new update has a newer period management, which needs the starting day and the period length. After updating, the previous configuration will be automatically migrated to the new version, but you may want to check it just in case.