* Added blocks for splitting and merging image channels

Grinder/Grinder.pro

Grinder/Version.h

Grinder/controller/ProjectController.cpp

Grinder/engine/processors/AlphaBlendingProcessor.cpp

Grinder/engine/processors/BinaryThresholdProcessor.cpp

Grinder/engine/processors/MergeChannelsProcessor.cpp

Grinder/engine/processors/MergeChannelsProcessor.h

Grinder/engine/processors/SplitChannelsProcessor.cpp

Grinder/engine/processors/SplitChannelsProcessor.h

Grinder/pipeline/BlockCatalog.cpp

Grinder/pipeline/BlockHierarchy.cpp

Grinder/pipeline/BlockHierarchy.h

Grinder/pipeline/BlockType.cpp

Grinder/pipeline/BlockType.h

Grinder/pipeline/PortType.cpp

Grinder/pipeline/PortType.h

Grinder/pipeline/blocks/MergeChannelsBlock.cpp

Grinder/pipeline/blocks/MergeChannelsBlock.h

Grinder/pipeline/blocks/SplitChannelsBlock.cpp

Grinder/pipeline/blocks/SplitChannelsBlock.h