CI 2.2 updates
Docs updates

- Document server environment variable
- Update Coding Conventions
- Changelog updates for 0.7.2
Emailer language prefix change from em_ to emailer_
Contexts menu improvements

Still needs a lot of work, but this slightly improves the performance
for large context menus.
Remove use of deprecated EXT constant
Prep settings library for observers/drivers
logs_delete1_note isn't setup for use with sprintf()...