If --user-data-dir is not set, auto-detect: use ../user_data when
./user_data doesn't exist, making it easy to share user data across
portable builds by placing it one folder up.
- Remove instruction templates from prompt dropdowns (default/notebook)
- Add 3 buttons to Parameters > Instruction template as a replacement
- Increase the number of lines of 'negative prompt' field to 3, and add a scrollbar
- When uploading a character, switch to the Character tab
- When uploading chat history, switch to the Chat tab