Overhaul animation queues so the queue is stored as a single encoded string.

luprex/cpp/core/util.hpp

@@ -223,6 +223,8 @@ using StringSet = eng::set<eng::string>;
 using LuaSourceVec = eng::vector<StringPair>;
 using LuaSourcePtr = std::unique_ptr<LuaSourceVec>;
 using HashValue = std::pair<uint64_t, uint64_t>;
+using SharedStdString = std::shared_ptr<std::string>;
+using SharedStdStringVec = std::vector<SharedStdString>;
 
 // Ascii uppercase and lowercase.
 eng::string ascii_tolower(std::string_view c);