Added Move, ListAllInfo, List, and Find commands.

ListAllInfo is just a call to MPD's listallinfo, which passes out all of the info about songs in the requested URI.

The list command will let you search the database for metadata. For example, if you just wanted all the artists in your database, you can use `list artist`. If you wanted to find all albums that the band "name" owns, you would use:
`list album artist "name"`.

The Find command is very similar to ListAllInfo, but you can use different search parameters
instead of just a file path.