Add static modifier to logger constants, make some instance variables final

.../de/deadlocker8/budgetmaster/accounts/AccountService.java

.../deadlocker8/budgetmaster/authentication/UserService.java

...java/de/deadlocker8/budgetmaster/charts/ChartService.java

...er8/budgetmaster/reports/columns/ReportColumnService.java

.../budgetmaster/reports/settings/ReportSettingsService.java

...a/de/deadlocker8/budgetmaster/services/ImportService.java

...de/deadlocker8/budgetmaster/settings/SettingsService.java

...n/java/de/deadlocker8/budgetmaster/tags/TagScheduler.java

...locker8/budgetmaster/transactions/TransactionService.java