Optimized Layouts & emptyView implementation

* Removed unnecessary overdraw where possible
* Added the correct handling of empty ListViews for Scripts, Looks,
  Sounds.
* Fix tests that failed after removal of ListView
* Deleted FtpProgressInputStream
* Remove "fix" in UiTestUtils
Merge pull request #669 from Catrobat/layout_optimization

Optimized Layouts & emptyView implementation