Queue command format and Auto-Announce feature

[Nyhilo]

I did a reformat on the queue command to make it more compact and to give a bit more info (such as playtimes).
Looks like this:

I also added a configurable feature that auto-announces when a new song starts playing. Useful for people to see what's on deck at a glance without having to do $np

[Nyhilo]

This PR also resolves issue #40.

I'm not well practiced in contributing the code I write, so let me know if you need anything from me @Raptor123471.

[Raptor123471]

I have not had a chance to run this yet but it looks great. My only suggestion right now is that the auto announce configuration in config.py becomes a setting in settings.py so that it can become configurable per guild. I will test your PR out when I get the chance.

[Nyhilo]

Yeah I can do that. I was little unclear about how settings.py is organized, but I've got some time this afternoon to work on it.

[Nyhilo]

I did the move from the config to settings.py, and I resolved the merge conflicts.

However, it seems like an existing settings.json value doesn't actually take the new setting until you run set announce_tracks true once, even though upgrade() runs. Not sure why

[Raptor123471]

That's a mistake on my part where the missing keys are found and set in memory but never written to disk in the 'upgrade' function. I will push the fix and then we can get this PR merged. Check out #72 . I'm going to test it some more when I am home.

[Raptor123471]

When the setting start_voice_channel is set it bypasses uconnect() which will have ctx = none. See line 71 and 79 in run.py. For this feature to work when using these settings uconnect() would need to be reworked to accept an optional voice_channel argument for use in run.py and for line 71 & 79 to use uconnect().