Remove view tests from cttUnitTest
Implement InsertionWidget
Implement VideoProcessingWidget
Implement PlayerWidget
Alter method signature of writeToFile
Add and implement FilterListViewElement
Add method stubs and fix errors for a proper build
Move tests to cttApp
Update localization file
Merge branch 'viewDieZweite' of https://github.com/v02460/ctt into viewDieZweite
Add FilterInsertionWidget as subclass of InsertionWidget