* Command API function to addHook(command, callback)
* Commands open to callbacks must return information or indicate failed completion by return false
* Hooks to be added in module onLoad
* Command loop checks for available hooks and return state, then applies with module scope.
* onLoad running moved to end of all module loading to facilitate this without order problems
* Added example for ~qadd dent
* May now add property 'access' to commands specifying 'moderator' or 'admin' level access
* Add 'moderators' key to config
* Convert commands in admin module to use command marshalling listener rather than its own
