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/source/app.d

@@ -253,7 +253,7 @@ void mainLoop(void* arg)
     if(launcher.tool && launcher.tool_repeat != 0 && launcher.mouse.left && !igIsWindowHovered(ImGuiHoveredFlags_AnyWindow) && !igIsWindowFocused(ImGuiFocusedFlags_AnyWindow))
     {
         float range = 500.0 / cast(float)launcher.tool_repeat;
-        launcher.repeat_time += launcher.delta_time;
+        launcher.repeat_time += launcher.delta_time*100;
         while(launcher.repeat_time > range)
         {
             launcher.repeat_time -= range;