🔧 Removed SourceFileUtils (#2571)

Not needed anymore from version 3.8 of CMake (which is our minimum required)

src/CMakeLists.txt

@@ -1,5 +1,3 @@
-include(SourceFileUtils)
-
 set(SOURCE_FILES main.cpp
         Application.cpp
         Application.hpp
@@ -459,7 +457,7 @@ elseif (APPLE)
 endif ()
 
 # Generate source groups for use in IDEs
-generate_source_groups(${SOURCE_FILES})
+source_group(TREE ${CMAKE_SOURCE_DIR} FILES ${SOURCE_FILES})
 
 add_executable(${PROJECT_NAME} ${SOURCE_FILES})