HelpLine: add structured answer.

Also, restructure data sources to make it easier for non-technical
people to contribute.
Braille: use structured answer.
Factors: use strcutured answer.
LeetSpeak: add structured_answer.
Lowercase: add structured_answer.
Uppercase: add structured answer
TitleCase: move to structured_answer.

Also, tighten up triggers by:

- Paring back possible words to versions of 'title case'
- Requiring `start`-only trigger, like lower and upper versions.