Create common headers for plugins

Builds/VisualStudio2013/Plugins/Plugin_Debug32.props

Builds/VisualStudio2013/Plugins/Plugin_Debug64.props

Builds/VisualStudio2013/Plugins/Plugin_Release32.props

Builds/VisualStudio2013/Plugins/Plugin_Release64.props

Source/Plugins/ArduinoOutput/ArduinoOutput.h

Source/Plugins/ArduinoOutput/ArduinoOutputEditor.h

Source/Plugins/ArduinoOutput/OpenEphysLib.cpp

Source/Plugins/ArduinoOutput/serial/ofArduino.h

Source/Plugins/BasicSpikeDisplay/OpenEphysLib.cpp

...e/Plugins/BasicSpikeDisplay/SpikeDetector/SpikeDetector.h

...ins/BasicSpikeDisplay/SpikeDetector/SpikeDetectorEditor.h

...s/BasicSpikeDisplay/SpikeDisplayNode/SpikeDisplayCanvas.h

...s/BasicSpikeDisplay/SpikeDisplayNode/SpikeDisplayEditor.h

...s/BasicSpikeDisplay/SpikeDisplayNode/SpikeDisplayNode.cpp

...ins/BasicSpikeDisplay/SpikeDisplayNode/SpikeDisplayNode.h

Source/Plugins/CAR/CAR.h

Source/Plugins/CAR/OpenEphysLib.cpp

Source/Plugins/ChannelMappingNode/ChannelMappingEditor.cpp

Source/Plugins/ChannelMappingNode/ChannelMappingEditor.h

Source/Plugins/ChannelMappingNode/ChannelMappingNode.h