-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

README.md

@@ -57,7 +57,6 @@ There are some assumptions that should be considered when developing application
  * Better EventManager - there are several optimization and improvements that can be added in the future. 
  * More demos and examples - demo appliaction is very basic now, but in future more minigames and sanbox mode (opportunity to mix many components and systems) are planned.
  * C API - in highly depends on amount of work required. Makes possible to use library from different languages.
- * GPU compute - idea in draft stage. Special components and systems whose data wolud be on GPU memory.
  * More smaller improvements...
 
 For more information about design and usage feel free to read [documentation](https://mergul.gitlab.io/bubel-ecs/ecs.html)**(WIP)** and [WIKI](https://gitlab.com/Mergul/bubel-ecs/-/wikis/home).
@@ -104,14 +103,12 @@ Online demo support multithreading and page tries to check if client support WAS
 
 struct Position
 {
-    mixin ECS.Components; //makes struct component
     float x;
     float y;
 }
 
 struct Velocity
 {
-    mixin ECS.Components;
     //default values works
     float x = 0.1;
     float y = 1;
@@ -119,7 +116,6 @@ struct Velocity
 
 struct StaticFlag
 {
-    mixin ECS.Components;
 }
 
 struct UpdateSystem
@@ -132,7 +128,7 @@ struct UpdateSystem
     {
         int length; //entities count
         @readonly Entity[] entities; //entities arrays, entity contain ID only
-        Position[] positions; //positions array
+        Position[] positions; //positions array, by default components are considered to has write access (used for multithreading dependencies)
         @readonly Velocity[] velocities; //veocities array, readonly (Multithreading tag)
     }
 
@@ -158,7 +154,7 @@ void main()
     manager.endRegister();
 
     //allocate template
-    EntityTemplate* tmpl = manager.allocateEmplate([Velocity.component_id, Position.component_id].staticArray);
+    EntityTemplate* tmpl = manager.allocateEmplate([becsID!Velocity, becsID!Position].staticArray);
     scope (exit) manager.freeTemplate(tmpl);
 
     //gets pointer to template component data
@@ -170,9 +166,9 @@ void main()
         manager.addEntity(tmpl);
     }
 
-    manager.begin(); //start frame
+    manager.begin(); //start frame, inside system onBegin callbacks are called
     manager.update(); //update all systems, there onUpdate callbacks are called
-    manager.end(); //end frame
+    manager.end(); //end frame, inside system onEnd callbacks are called
 }
 
 ```