Average data usage widget

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V 4.1
- Added Russian translation. Thank you kojjii!

v 4.0
- Updated to Android 10+
- New: Average and total data on the history screen
- Tweak: Remaining tweak promoted to full setting (Pending/Used)
- New: Option to calculate accumulated data by setting the desired visible amount
- Improv: Accumulated data can be negative
- Improv: Accumulated data can be set while accumulated period is 0 (as offset data)
- New: Tweak: open android settings when clicking the widget button