-fixed removingComponents issue (object was transferred to another block, but count of entities in block doesn't increase)

-functions to get System by ID or ECS System by Type
-added system_id to system
-fixed issue with registering systems without update() function

tests/tests.d

@@ -119,6 +119,13 @@ int main()
 
 		}
 
+		struct InputData
+		{
+			TestComp* test;
+			TestComp2* test2;
+			@("optional") TestComp3* test3;
+		}
+
 		void update(ref Entity entity, ref TestComp test, ref TestComp2 test2, TestComp3* test3) //ref TestComp comp)
 		{
 			assert(cast(size_t)&test % TestComp.alignof == 0);