Implement RescaleFilter
Fix wrong YUV type in MixFilterTest
Add RescaleFilter testcases
Enable implemented filter in the FilterFactory
Fix missing return statements, project settings and missing semicolons
Implement NoiseFilter
Add dummy files for filter tests
Add test cases for GreyscaleFilter
Add test cases for NoiseFilter
Add test cases for TimeshiftFilter
Implement RGBChannelFilter
Add test cases for RGBChannelFilter
Merge master into FilterFlamingo