Toastmanager and ToastTests

ToastTest in UnwantedOutputTest added
ToastManager in all Toast-classes

Incomming Jenkins Testrun:
https://jenkins.catrob.at/view/All-Categories/view/Catroid-multi-job/job/Catroid-Multi-Job-Custom-Branch/1649/
This file still has some wrong indentations please use single TAB everywhere.