Add card::get_assumed_property

Helper function to return a property set by AssumeProperty as std::optional

card.h

@@ -8,6 +8,7 @@
 #define CARD_H_
 
 #include <map>
+#include <optional>
 #include <set>
 #include <unordered_map>
 #include <unordered_set>
@@ -187,6 +188,13 @@ class card : public lua_obj_helper<LuaParam::CARD> {
 	bool is_extra_deck_monster() const { return !!(data.type & (TYPE_FUSION | TYPE_SYNCHRO | TYPE_XYZ | TYPE_LINK)) && !!(data.type & TYPE_MONSTER); }
 
 	void get_infos(uint32_t query_flag);
+	std::optional<uint64_t> get_assumed_property(uint32_t assume_type) const {
+		auto assumed = assume.find(assume_type);
+		if(assumed != assume.end()) {
+			return assumed->second;
+		}
+		return std::nullopt;
+	}
 	int32_t is_related_to_chains();
 	loc_info get_info_location();
 	uint32_t second_code(uint32_t code);