Cleaned up the reflection code a bit

* Renamed 'tag' variable to 'handler'
* Removed addAlias stuff, instead check for matching names with if statements
* Added after_reading function that is called by Reader after reading a complete object. This generalizes Packaged::validate, which is now also called via this mechanism.
* Removed some backwards compatibility with <0.3.0 for templates

src/data/set.hpp

@@ -126,8 +126,8 @@ class Set : public Packaged {
 
   private:
   DECLARE_REFLECTION();
-  template <typename Tag>
-  void reflect_cards (Tag& tag);
+  template <typename Handler>
+  void reflect_cards(Handler& handler);
   
   /// Object for managing and executing scripts
   unique_ptr<SetScriptManager> script_manager;