Delete removes a value from a key matching substring `substr`.

Lookup returns a string to output to the channel, and a bool indicating if it's an action ('/me blabla').

NewReplyString adds a custom reply string to the list of reply strings TODO: generalize config file read/write/parse TODO: switch to toml for config.

ParseConfFile parses configuration in `filename` and returns a configuration and an error.

Search will look through the entire database, both keywords and facts, for the regular expression in rex.

Store saves a factoid to the database.