Group notes in reminders "upcoming" section by periods (this week, next week, month, etc)

[W1zardK1ng]

Currently under the reminders sections we only have overdue, today and upcoming.
Please split the upcoming section like this week, next week, this moth and next months so that its much easier to track the upcoming tasks

[maltaisn]

I won't work on this.

If you want to make a pull request, here's a rough breakdown of the work involved:

1. In HomeViewModel, there's a createRemindersListItems function. The notes it takes are already sorted by next reminder date, and there are already headers being added there. Just add the other headers according to the date.

2. Update tests.