Resolves Honeytrap configuration keys.

Each accessor takes an optional opts keyword list. Values in opts win. Otherwise the value is read from Application.get_env(:honeytrap, key). Otherwise the built-in default is used.

Recognised keys:

• :default_delay (default 2.0)
• :disable_delay (default false)
• :minimum_human_rating (default nil)
• :signals_input_name (default "honeytrap_signals")