Change KMyMoneyEdit to AmountEdit
Summary:
Refactor KMyMoney to use just AmountEdit
Test Plan: "make test" and explore the interface
Reviewers: KMyMoney, tbaumgart
Reviewed By: KMyMoney, tbaumgart
Subscribers: wojnilowicz, brunourias, tbaumgart
Differential Revision: https://phabricator.kde.org/D20887