Removed useless include, corrected some bugs

app/Operations/CenterOp.cpp

app/Operations/CombineColorOp.cpp

app/Operations/FFTOp.cpp

app/Operations/FlipOp.cpp

app/Operations/IFFTOp.cpp

app/Operations/PointOp.cpp

app/Operations/RotateOp.cpp

app/Operations/SplitColorOp.cpp

app/Operations/ThresholdOp.cpp

app/Operations/TranslateOp.cpp

app/Services/OperationService.cpp

core/Operation.h

core/PlugOperation.cpp

core/PlugOperation.h

plugins/Segmentation/segmentation.cpp