-updated README.md

-fixed shaders for GL2
-added Entity selection tool
-throw out tools from "Demo" window to "Tools" window
-change ComboBox to Tabs for Tools
-Added more verbose tips
-Improved and fixed BrickBreaker collisions
-fixed simple DUB issue

demos/source/game_core/basic.d

@@ -97,6 +97,10 @@ struct CVelocityFactor
     vec2 value = vec2(1);
 }
 
+struct CStatic
+{
+    mixin ECS.Component;
+}
 
 struct DampingSystem
 {