moved DatabaseHandler to SparkServer (only one connection to avoid errors)

...de/deadlocker8/budgetmasterserver/server/SparkServer.java

...cker8/budgetmasterserver/server/category/CategoryAdd.java

...r8/budgetmasterserver/server/category/CategoryDelete.java

...cker8/budgetmasterserver/server/category/CategoryGet.java

...r8/budgetmasterserver/server/category/CategoryGetAll.java

...r8/budgetmasterserver/server/category/CategoryUpdate.java

...masterserver/server/categorybudget/CategoryBudgetGet.java

.../budgetmasterserver/server/payment/normal/PaymentAdd.java

...dgetmasterserver/server/payment/normal/PaymentDelete.java

.../budgetmasterserver/server/payment/normal/PaymentGet.java

...dgetmasterserver/server/payment/normal/PaymentUpdate.java

...rserver/server/payment/repeating/RepeatingPaymentAdd.java

...rver/server/payment/repeating/RepeatingPaymentDelete.java

...rserver/server/payment/repeating/RepeatingPaymentGet.java

...rver/server/payment/repeating/RepeatingPaymentGetAll.java

...tmasterserver/server/updater/RepeatingPaymentUpdater.java