Demos update:

-modified texture atlas
-fixed bug with high CPU usage (use pthread instead of builtin D multithreading)
-added new graphics
-snake now render tile coresponding to body part
-snake is destroyed after collision and emit some particles
-added some functionality to vectors
-fixed documentation issue in Manager.d

demos/external/sources/mmutils/thread_pool.d

@@ -12,6 +12,8 @@ import std.algorithm : map;
 version = MM_NO_LOGS; // Disable log creation
 //version = MM_USE_POSIX_THREADS; // Use posix threads insted of standard library, required for betterC
 
+version (Posix)version = MM_USE_POSIX_THREADS;
+
 version (WebAssembly)
 {
 	extern(C) struct FILE