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.

tests/time.d

@@ -0,0 +1,66 @@
+module tests.time;
+
+
+version (WebAssembly)
+{
+	alias int time_t;
+	alias int clockid_t;
+	enum CLOCK_REALTIME = 0;
+
+	struct timespec
+	{
+		time_t tv_sec;
+		int tv_nsec;
+	}
+
+	extern (C) int clock_gettime(clockid_t, timespec*) @nogc nothrow @system;
+
+	struct Time
+	{
+		static long getUSecTime()
+		{
+			time_t time;
+			timespec spec;
+
+			clock_gettime(CLOCK_REALTIME, &spec);
+
+			//time = spec.tv_sec;
+			return spec.tv_sec * 1000_000 + spec.tv_nsec / 1000; //time / 1000_000;
+		}
+	}
+}
+else version (Windows)
+{
+	import core.stdc.stdio : printf;
+	import core.sys.windows.windows;
+
+	struct Time
+	{
+		static long getUSecTime()
+		{
+			LARGE_INTEGER time, freq;
+			QueryPerformanceFrequency(&freq);
+			QueryPerformanceCounter(&time);
+			return time.QuadPart / (freq.QuadPart / 1000_000);
+		}
+	}
+}
+else version (Posix)
+{
+	import core.stdc.stdio : printf;
+	import core.sys.posix.time;
+
+	struct Time
+	{
+		static long getUSecTime()
+		{
+			time_t time;
+			timespec spec;
+
+			clock_gettime(CLOCK_REALTIME, &spec);
+
+			//time = spec.tv_sec;
+			return spec.tv_sec * 1000_000 + spec.tv_nsec / 1000; //time / 1000_000;
+		}
+	}
+}