Fixed issues and bugs

-moved system destroy functionality to System structure "destroy()" function
-now arrays are properly destroyed (with destructor calling (__xdtor))
-fixed bug which makes BlockAllocator crashing after freeing it's memory
-fixed many smaller memory leaks

source/bubel/ecs/simple_vector.d

@@ -12,6 +12,12 @@ struct SimpleVector
 {
 
     @disable this(this);
+    
+    ~this() nothrow @nogc
+    {
+        if(data)
+            Mallocator.dispose(data);
+    }
 
     ///Add element to vector
     void add(ubyte el) nothrow @nogc