Update to newer VTK

CMake/SuperBuild.cmake

 endif()
 
 if ( LEMMA_VTK9_SUPPORT )
+    if ( VTK_FOUND )
+        message(STATUS "VTK FOUND!")
+    endif()
     if ( NOT VTK_FOUND OR  VTK_VERSION VERSION_LESS "9.0.0" )
-        message( STATUS "VTK > 8.20.0 was found! Version found: " ${VTK_VERSION}, ${VTK_USE_FILE} )
-        message( STATUS "External build of VTK 8 has been added, this may take some time to build." )
+        #message( STATUS "VTK > 8.20.0 was found! Version found: " ${VTK_VERSION}, ${VTK_USE_FILE} )
+        message( STATUS "External build of VTK 9 has been added, this may take some time to build." )
         ExternalProject_Add(VTK9
         GIT_REPOSITORY "https://gitlab.kitware.com/vtk/vtk.git"
-        GIT_TAG  "v9.0.1"
-        PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/vtk8
+        GIT_TAG  "v9.3.0"
+        PREFIX ${CMAKE_CURRENT_BINARY_DIR}/external/vtk9
         CMAKE_ARGS
             -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
             -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} /

CMakeLists.txt

-cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.10.0 FATAL_ERROR)
 
 # add this options before PROJECT keyword
 set(CMAKE_DISABLE_SOURCE_CHANGES ON)