Convert enumeration MyMoneyReport::EReportType into a class to be more type safe
CCBUG:391091
Test Plan: compiled on linux
Reviewers: KMyMoney
Reviewed By: KMyMoney, tbaumgart
Differential Revision: https://phabricator.kde.org/D11058
Signed-off-by: Ralf Habacker <ralf.habacker@freenet.de>