Update Groovy functionality/garbage collection to work with Hydra

[spark-c]

SparksieBOT normally ensures that music commands are only used in the proper channels, and deletes any messages from the music bot that are sent outside of the correct channel.

After the transition to Hydra, most of the functionality should still work as-is, however I think there are a couple of things (like deleting the bot's messages when appropriate) that will need to be updated to work as desired.