Started removing all old ifilter stuff

	modified:   ../cvt/CMakeLists.txt
	deleted:    ../cvt/gfx/ifilter/AdaptiveThreshold.cpp
	deleted:    ../cvt/gfx/ifilter/AdaptiveThreshold.h
	deleted:    ../cvt/gfx/ifilter/ColorCode.cpp
	deleted:    ../cvt/gfx/ifilter/ColorCode.h
	deleted:    ../cvt/gfx/ifilter/MorphDilate.cpp
	deleted:    ../cvt/gfx/ifilter/MorphDilate.h
	deleted:    ../cvt/gfx/ifilter/MorphErode.cpp
	deleted:    ../cvt/gfx/ifilter/MorphErode.h
	deleted:    ../cvt/gfx/ifilter/Sobel.cpp
	deleted:    ../cvt/gfx/ifilter/Sobel.h
	deleted:    ../cvt/gfx/ifilter/Threshold.cpp
	deleted:    ../cvt/gfx/ifilter/Threshold.h