Kill custom triggers
Kill custom triggers

The rationale for this was the following:

- I already have tags, and most of the time tags are good enough.
- Custom triggers can be annoying, since they can be triggered through
  normal speech.
- I can't figure out a way to allow for the following:
    - Make a restriction of one trigger per name, unless it's designated
      to be random.

Overall I'm not really sure if it would be good to bring triggers back.
If people want them back, I would like to know.

Ikusaba-san/Chiaki-Nanami