Average data usage widget

Invalid date

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

V 2.4
- Fixed incorrect accumulated after a period change
- New tweak: Hide bars
- New tweak: Hide labels
- Always show secondary progress while negative (-50% = -150%...)

V 2.3
- Changed accumulate data checkbox to slider, to specify how many months it is accumulated (if was enabled it is now 1)