Re-added locatable so I can do it on backend this time.
Merge pull request #3 from CSc436/backend-dev-notify

Re-added locatable so I can do it on backend this time.
Made it so GameObject implements Locatable instead of Unit.
Added message to migrate to Ben's command thing.
Added the minimum dispatch code necessary so it won't mess with anyone else's stuff but still has some barebones implementation so people can see what's going on in there.
Entered enough skeleton code so the approach makes sense.
Merge pull request #4 from CSc436/backend-dev-notify

Because this doesn't break any existing compatibility on backend-master, I'm merging it. That way other people can see the code I've added and get an idea for where I'm going with it.