Demo update and start counting tests times

-Fixed performance issue with multithreading and rendering
-start making better shaders (by using many macros)
-speed up rendeing when maximum objects count was reached
-remove map rendering form Snake demo, and render entities by themself
-start adding depth and color rendering parameters
-added properly names to jobs (for debugging purpses)
-starts adding multithreaded rendering
-added some math to vectors
-changes execute() to willExecute(). Probably should have different name.

demos/utils/source/ecs_utils/math/vector.d

@@ -97,6 +97,15 @@ struct ivec2
         int[2] data;
     }
 
+    ivec2 opBinary(string op, T)(T v)
+    {
+        static if (op == "+") return ivec2(x + v, y + v);
+        else static if (op == "-") return ivec2(x - v, y - v);
+        else static if (op == "*") return ivec2(x * v, y * v);
+        else static if (op == "/") return ivec2(x / v, y / v);
+        else static assert(0, "Operator "~op~" not implemented");
+    }
+
     vec2 opCast()
     {
         return vec2(x,y);