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

-removed some ECS mixins code

source/bubel/ecs/traits.d

@@ -2,6 +2,18 @@ module bubel.ecs.traits;
 
 import std.traits;
 
+ref ushort ecsID(T)()
+{
+	__gshared ushort id = ushort.max;
+	return id;
+}
+
+ref ushort ecsID(T)(T obj)
+{
+	static if(isPointer!T)return ecsID!(PointerTarget!T);
+	else return ecsID!T;
+}
+
 bool isForeachDelegateWithTypes(DG, Types...)()
 {
 	return is(DG == delegate) && is(ReturnType!DG == int) && is(Parameters!DG == Types);