Enhance message editor with import/export functionality for messages, including file handling and UI updates

src/app/editor/message/message_data.h

@@ -311,6 +311,12 @@ std::vector<std::string> ParseMessageData(
     std::vector<MessageData> &message_data,
     const std::vector<DictionaryEntry> &dictionary_entries);
 
+constexpr int kTextData2 = 0x75F40;
+constexpr int kTextData2End = 0x773FF;
+
+// Reads all text data from the ROM and returns a vector of MessageData objects.
+void ReadAllTextData(Rom *rom, std::vector<MessageData> &list_of_texts_);
+
 std::vector<std::string> ImportMessageData(std::string_view filename);
 
 }  // namespace editor