Refactored Utils class in Paintroid project
Refactored Utils classes in PaintroidTest
Deleted duplicated CropToolIntegrationTest
Renamed HideToolbarTest
Deleted dialog animation, all dialogs are using the same now
Deleted unnecessary *.xml
drawing surface thread hack commented out, redesign save dialog
Merge branch '8.79_Refactor_Utils' of https://github.com/Catrobat/Paintroid into 8.79_Refactor_Utils
Merge pull request #71 from Catrobat/8.79_Refactor_Utils

8.79 refactor utils
implementation: @michealmuenzer [mm]
acceptance: @galstc05 [sg]