Re-introduces medClutEditor: displayed but not functional

Conflicts:
	app/medInria/medVisualizationWorkspace.cpp
	app/medInria/medWorkspaceArea.h
	src/medCore/views/medAbstractView.h
New version of medClutEditor (however needs medClutEditor plugin)

Conflicts:
	src/medCore/gui/lookUpTables/medClutEditor.h
Displays histo on Mac with CTRL

Conflicts:
	app/medInria/medVisualizationWorkspace.cpp
[MUSIC] [CLUT] Makes medClutEditor work fine (goes with music-plugins commits)
[MUSIC] [CLUT_E] Adds Discrete Mode and Actions on vertices

Conflicts:
	src/medCore/gui/lookUpTables/medClutEditor.cpp
[MUSIC] [CLUT_E] Adds medClutEditorTbx