Turn MessageCenter into a processor

Builds/Linux/Makefile

Builds/MacOSX/open-ephys.xcodeproj/project.pbxproj

Builds/VisualStudio2012/open-ephys.vcxproj

Builds/VisualStudio2012/open-ephys.vcxproj.filters

Source/AccessClass.h

Source/Processors/Editors/MessageCenterEditor.cpp

Source/Processors/Editors/MessageCenterEditor.h

Source/Processors/GenericProcessor.h

Source/Processors/MessageCenter.cpp

Source/Processors/MessageCenter.h

Source/Processors/ProcessorGraph.cpp

Source/Processors/ProcessorGraph.h

Source/UI/ControlPanel.cpp

Source/UI/UIComponent.cpp

Source/UI/UIComponent.h

open-ephys.jucer