Average data usage widget

Apr 5, 2020

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

V 2.2
- Allow changing number of decimals data numbers show
- Allow showing data in GB instead of MB
- Make history screen react to tweaks too (keep bar at 100% tweak)

V 2.1
- Tweaks: experimental changes to modify properties of the widgets. Include common request such as white theme, widget with only data/date, keep bar at 100% and some more.