otaku 0.2.2

• New providers: OpenRouter and NanoGPT (cloud), llama.cpp and LM Studio (local); the prompt for
  cloud providers is $ instead of >.
• Numerous UI improvements, including:
  • dialogue coloring;
  • undo erases the taken-back exchange from the screen;
  • regenerate erases the old reply and streams the new one in its place;
  • a rule drawn across the screen wherever the played story breaks;
  • providers configurable directly in the model picker (/model or Ctrl+O);
  • /system accepting a file in addition to text input.
• New commands: /clear, /last, /balance; command /rename renamed to /title.
• New CLI command: otaku update.