Add a sentry logic and a steamrep command

!steamrep returns various info from steamrep's web api. Steamrep's web api supposedly requires a post in their forum requesting access to it, but I haven't done so and they're not blocking me. Note: the data in steamrep's api is a bit out of date. If it needs to be updated, the only way I know of to do so is to visit their website.

Also, I added a bit of code to check for a sentry file and a code at connection time. This is probably not required, but I forgot it was in there when I made the first commit and didn't notice it until now... It would be better to name the sentry file based on the login name, as that way you could have multiple sentry files and config files in the same directory.