Remove VideoDataLoader.py class

This class can now be removed, because it was used only in VideoQualityMeasure and VideoLBPHistogram, which are deleted.

mentioned in commit 50bd1562

mentioned in merge request !56 (merged)

closed via commit e0fc9e9b

closed via commit 50bd1562

closed via merge request !56 (merged)

mentioned in commit e0fc9e9b