Implement FrameDiff
Correct PixelDiff comment spelling
Implement DifferenceFactory
More FilteredVideoTesting.
Merge branch 'master' into jonas
Adds some Tests, fixes some mistakes these tests find.
Merge master into DumbDiffer
Merge DumbDiffer into master
Add getRawRGB method to Surface
Fix comment in GPUHelper
Rename getRawRGB to getRawRGBA in Surface
Restore project folder with shader files
Implement FilterParam
Merge master into FilterFlamingo