Add CLion CMake facade project generation

Add CLion as a supported editor workflow for native C++ development.
The new -clion generation option writes a CMake facade project under
Cache/Projects/CMake/<ProjectName>, exposing a CLion-friendly code model,
build presets, and launcher targets while keeping Flax.Build as the source
of truth for native builds.

Source/Editor/Modules/SourceCodeEditing/DefaultSourceCodeEditor.cs

@@ -40,6 +40,7 @@ namespace FlaxEditor.Modules.SourceCodeEditing
             var codeEditing = Editor.Instance.CodeEditing;
             var vsCode = codeEditing.GetInBuildEditor(CodeEditorTypes.VSCode);
             var rider = codeEditing.GetInBuildEditor(CodeEditorTypes.Rider);
+            var clion = codeEditing.GetInBuildEditor(CodeEditorTypes.CLion);
 
 #if PLATFORM_WINDOWS
             // Favor the newest Visual Studio
@@ -66,6 +67,8 @@ namespace FlaxEditor.Modules.SourceCodeEditing
                 _currentEditor = vsCode;
             else if (rider != null)
                 _currentEditor = rider;
+            else if (clion != null)
+                _currentEditor = clion;
             else
                 _currentEditor = codeEditing.GetInBuildEditor(CodeEditorTypes.SystemDefault);
         }