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/system.d

@@ -91,6 +91,38 @@ struct System
 
 package:
 
+    void destroy()
+    {
+        import bubel.ecs.std : Mallocator;
+        disable();
+        if (m_destroy)
+            (cast(void function(void*)) m_destroy)(m_system_pointer);
+
+        if (m_name)
+            Mallocator.dispose(m_name);
+        if (m_components)
+            Mallocator.dispose(m_components);
+        if (m_excluded_components)
+            Mallocator.dispose(m_excluded_components);
+        if (m_optional_components)
+            Mallocator.dispose(m_optional_components);
+        if (jobs)
+            Mallocator.dispose(jobs);
+        if (m_read_only_components)
+            Mallocator.dispose(m_read_only_components);
+        if (m_writable_components)
+            Mallocator.dispose(m_writable_components);
+        if (m_readonly_dependencies)
+            Mallocator.dispose(m_readonly_dependencies);
+        if (m_writable_dependencies)
+            Mallocator.dispose(m_writable_dependencies);
+        if (m_event_callers)
+            Mallocator.dispose(m_event_callers);
+
+        if (m_system_pointer)
+            Mallocator.dispose(m_system_pointer);
+    }
+
     struct EventCaller
     {
         ushort id;