Adding some tags to scene item components for the prefab tool

src/dawn/scene/components/display/Camera.hpp

@@ -28,16 +28,24 @@ namespace Dawn {
         return cam;
       }
 
+      // @optional
       StateProperty<RenderTarget*> renderTarget;
+      // @optional
       StateProperty<float_t> fov;
+      // @optional
       StateProperty<enum CameraType> type;
 
+      // @optional
       StateProperty<float_t> orthoLeft;
+      // @optional
       StateProperty<float_t> orthoRight;
+      // @optional
       StateProperty<float_t> orthoBottom;
+      // @optional
       StateProperty<float_t> orthoTop;
-
+      // @optional
       StateProperty<float_t> clipNear;
+      // @optional
       StateProperty<float_t> clipFar;
 
       StateEvent<float_t, float_t> eventRenderTargetResized;

src/dawn/scene/components/display/MeshRenderer.hpp

@@ -15,6 +15,7 @@ namespace Dawn {
       MeshHost *meshHost = nullptr;
 
     public:
+      // @optional
       Mesh * mesh = nullptr;
 
       /**

src/dawn/scene/components/display/PixelPerfectCamera.hpp

@@ -17,6 +17,7 @@ namespace Dawn {
       void updateDimensions();
 
     public:
+      // @optional
       StateProperty<float_t> scale;
 
       /**

src/dawn/scene/components/display/SimpleRenderTargetQuad.hpp

@@ -15,6 +15,7 @@ namespace Dawn {
       std::function<void()> evtResized;
 
     public:
+      // @optional
       StateProperty<RenderTarget*> renderTarget;
 
       /**