-add ecsID template function (get Component/System/Event ID, passes tests)

-removed some ECS mixins code

source/bubel/ecs/events.d

@@ -4,6 +4,7 @@ import bubel.ecs.block_allocator;
 import bubel.ecs.entity;
 import bubel.ecs.manager;
 import bubel.ecs.std;
+import bubel.ecs.traits : ecsID;
 
 import std.algorithm.comparison : max;
 
@@ -32,7 +33,7 @@ package struct EventManager
     {
         uint block_id = current_index + thread_id;
 
-        EventData* data = &events[Ev.event_id];
+        EventData* data = &events[ecsID!Ev];
         EventBlock* block = data.blocks[block_id];
         //EntityManager.EventInfo* info = &manager.events[Ev.event_id];
         //event.entity_id = id;