Local itk-vtk-viewer

It is ready to install the itk-viewer in case it is not installed in qim https://www.notion.so/qim-dtu/Improve-CLI-viz-f4254522fa1e4159b8ce6d9206793b13

qim3d/viz/itk_vtk_viewer/run.py

@@ -29,7 +29,7 @@ def itk_vtk_viewer(filename:str = None):
     command = 'itk-vtk-viewer -s'
 
     def run_global():
-        if platform.system() == "Linux":
+        if platform.system() in ["Linux", "Darwin"]:
             subprocess.run(command, shell = True, stderr = subprocess.DEVNULL)
         elif platform.system() == "Windows":
             # First sourcing the node.js, if sourcing via fnm doesnt help and user would have to do it any other way, it would throw an error and suggest to install viewer to qim library