Implement planned payments

[sadespresso]

• Any transaction set in a future time (transactionDate) will be considered a planned payment

• On home screen, planned payments will appear as list of reminders. Or if there are too many of it, we'll display the first few, and add "See more" button.

• Planned payments will not have any effect on current account balance

• Planned payments must be confirmed by the user with a press of a button #120

• Implement a local notification as a reminder #121

  Although, I wonder if people would enjoy automated ones. When set in automated mode, we can resolve the planned payments at the startup.