Display payee as dropdown list

[fabianski7]

I've been using your app for a few days and it's really amazing, but I miss being able to have a complete list of all existing payees when adding an expense. Because of this, I've had several duplicates because I can't remember exactly how I recorded the last transaction with the same payee.

I've seen that there is an option to deal with duplicates, but I believe that displaying a list of all the options when creating the expense would avoid having to resort to this fix.