allow users to set minimum confidence level

[JamesOsborn-SE]

this is a feature request:

backstory: I thought I had gremlins but it turns out that the noise in my office and me being in meeting talking a lot cause seeming random lights and what not to turn on. I noticed in the logs that it thought I said turn on the hall light but the p value was really low like 0.14

ask: allow a user to set the minimum confidence level in configuration for intents