Changes

- New policy re. strings (quote is a paired delim. instead of a string ditto)
- Some fiddling with TP2 mode
Fix a bug with indenting END ELSE BEGIN; 2 million to go
Sundry

- Add a general hook shared by all the modes
- Tighten the matching of BG actions and triggers
- Add autoload cookies to all auto-mode-alist
- Add missing TP2 patch, BG trigger and action keywords
- Disable TP2 indent until work can begin on it again
Disorderly commit

- Fix several bugs in BAF indentation
- Make the hyphen/minus part of the charset for a TRA ref
- Lay the foundations for ElDoc support