Re #7894. Renamed ImageViewer subproject to SpectrumViewer.
Re #7894. Changed the name of the include directory.
Re #7894. Renaming image view in windoze installer.
Re #7894. Changed the namespace to SpectrumView
Re #7894. Renamed ImageView class to SpectrumView.
Re #7894. Changed reference in comments.
Re #7894. Getting rid of more ImageView references.
Re #7894. Renamed ImagePlotItem to SpectrumPlotItem.
Re #7894. Renamed ImageDisplay to SpectrumDisplay.
Re #7894. Changed export name.
Re #7894. Renamed ImageDataSource to SpectrumDataSource.
Re #7894. Renamed right-click menu item in workspace dock.
Re #7894. Renamed DllOptionIV.h to DllOptionSV.h.
Re #7894. Renamed IVUtils to SVUtils.
Re #7894. Renamed IVConnections to SVConnections.
Merge branch 'feature/7894_rename_image_view' into develop