Processor colors can now be customized

...yCode/src/gui/components/lookandfeel/juce_LookAndFeel.cpp

Source/Processors/Editors/GenericEditor.cpp

Source/Processors/Editors/GenericEditor.h

Source/Processors/Editors/MergerEditor.cpp

Source/Processors/Editors/MergerEditor.h

Source/Processors/Editors/SplitterEditor.cpp

Source/Processors/Editors/SplitterEditor.h

Source/Processors/GenericProcessor.h

Source/Processors/ProcessorGraph.cpp

Source/Processors/ProcessorGraph.h

Source/Processors/Utilities/Merger.cpp

Source/Processors/Utilities/Splitter.cpp

Source/Processors/Utilities/Splitter.h

Source/UI/EditorViewport.cpp

Source/UI/EditorViewport.h

Source/UI/ProcessorList.cpp

Source/UI/ProcessorList.h

Source/UI/SignalChainManager.cpp