fix the child position incorrect while parenting node; add camera focus func; treat icons to the asset and using AssetsManager::GetAsset to load it

Editor/assets/shaders/BloomBlend.glsl

@@ -48,7 +48,7 @@ void main()
     vec3 mappedColor = (mappedLuminance / luminance) * color* u_Exposure;
 
     // Gamma correction.
-    o_Color = vec4(color, 1.0);
+    o_Color = vec4(mappedColor, 1.0);
 #else
     const float gamma = 2.2;
     vec3 hdrColor = texture(u_SceneTexture, v_TexCoord).rgb;