implement card auctions

src/Episode3/DataIndex.hh

@@ -790,6 +790,8 @@ public:
 
   const std::string& get_compressed_card_definitions() const;
   std::shared_ptr<const CardEntry> definition_for_card_id(uint32_t id) const;
+  std::shared_ptr<const CardEntry> definition_for_card_name(
+      const std::string& name) const;
   std::set<uint32_t> all_card_ids() const;
 
   const std::string& get_compressed_map_list() const;
@@ -801,6 +803,7 @@ private:
 
   std::string compressed_card_definitions;
   std::unordered_map<uint32_t, std::shared_ptr<CardEntry>> card_definitions;
+  std::unordered_map<std::string, std::shared_ptr<CardEntry>> card_definitions_by_name;
 
   // The compressed map list is generated on demand from the maps map below.
   // It's marked mutable because the logical consistency of the DataIndex object