Demos update

-added some new types to gui manager + some fixes
-TexCoordsManager now working (probably)
-added CRenderDefault components which makes entities without texcoords possible to draw
-makes better way of binding demos to launcher
-moved some registration related to rendering to one function (basic components + draw system)
-added Sandbox demo (demo which takes all demos to one demo)
-extends ParticlesDemo play area
-added BirckBreaker demo (WIP)
-added special material to additive particles
-added whole bunch of rendering code to rendering module
-added ability to show filtered entities (blinking)

demos/source/demos/snake.d

@@ -851,6 +851,8 @@ __gshared Snake* snake;
 
 void snakeStart()
 {
+    import game_core.rendering;
+
     snake = Mallocator.make!Snake;
 
     snake.texture.create();
@@ -860,6 +862,8 @@ void snakeStart()
 
     launcher.manager.registerPass("fixed");
 
+    registerRenderingModule(launcher.manager);
+
     launcher.manager.registerComponent!CLocation;
     launcher.manager.registerComponent!CILocation;
     launcher.manager.registerComponent!CSnake;
@@ -983,4 +987,14 @@ bool snakeLoop()
     launcher.manager.end();
 
     return true;
+}
+
+DemoCallbacks getSnakeDemo()
+{
+    DemoCallbacks demo;
+    demo.initialize = &snakeStart;
+    demo.deinitialize = &snakeEnd;
+    demo.loop = &snakeLoop;
+    demo.tips = snake.tips;
+    return demo;
 }