component_traits: reduce impact of entity_like, and prepare to fix it

src/entt/entity/component.hpp

@@ -41,7 +41,7 @@ struct page_size<Type>: std::integral_constant<std::size_t, Type::page_size> {};
  * @tparam Type Element type.
  * @tparam Entity A valid entity type.
  */
-template<cvref_unqualified Type, entity_like Entity>
+template<cvref_unqualified Type, typename Entity>
 struct component_traits {
     /*! @brief Element type. */
     using element_type = Type;

src/entt/entity/fwd.hpp

@@ -44,7 +44,7 @@ enum class deletion_policy : std::uint8_t {
     unspecified = swap_and_pop
 };
 
-template<cvref_unqualified Type, entity_like Entity = entity>
+template<cvref_unqualified Type, typename Entity = entity>
 struct component_traits;
 
 template<entity_like Entity = entity, typename = std::allocator<Entity>>