(core): migrate TransferFunctionManagerWindow.xml from ogreViewer to ogreConfig
Description
The TransferFunctionManagerWindow configuration is quite useful for many applications. However, to integrate it, it requires either to duplicate the code or to add the ogreviewer target, which brings many additional unwanted dependencies.
Proposal
Moove the TransferFunctionManagerWindow.xml from ogreViewer to ogreConfig and link it properly in the ogreviewerxml. This would allow to add only ogreConfig to get the TransferFunctionManagerWindow