-fixed issue with ExcludedComponents as enum or alias

-removed way to add excluded component by adding attribiute @excluded (it's very stupid way)

source/ecs/attributes.d

@@ -2,7 +2,7 @@ module ecs.attributes;
 
 ///Used to mark optional components for system.
 enum optional = "optional";
-///Used to mark components excluded from update for system. Enum 'ExcludedComponents' should be used instead of it.
-enum excluded = "excluded";
+//Used to mark components excluded from update for system. Enum 'ExcludedComponents' should be used instead of it.
+//enum excluded = "excluded";
 ///Used to mark readonly components for system. "const" can be used insted.
 enum readonly = "readonly";