Messages.py clean-ups

[mzxrules]

• Expand nes_message_data_static to it's maximum size before overwriting the staff messages and removed the broken spillover to jpn_message_data_static. If the extra space is still not enough, let me know.
• Greatly simplified Message.size() and Message.write() by implementing Message.transform(), which modifies the message's text_code list before writing back.
• Text shuffle now accepts the message list, instead of waiting for all dialogs to be written back and then read from rom again