Reintroduce moderation commands

This was brought up on the Discord server:

[12:25] <Agent Neo>	But seriously those mod commands were hella useful
[12:26] <Agent Neo>	Just wish I could see 'em return
[12:26] <MightyMOE>	Well. talk to Laura
[12:27] <Ikaheishi>	They were pulled?
[12:27] <tc0>		rm -rf /*
[12:28] <MightyMOE>	Yeah
[12:28] <MightyMOE>	Cause it’s a splatoon bot and no one rlly used the commands
[12:28] <Agent Neo>	Trust me, moderation commands are always useful.
[12:29] <Agent Neo>	It made dealing with spam a lot easier
[12:29] <Ikaheishi>	Agreed
[12:29] <Agent Neo>	And not having multiple bots cluttering a member list is always nice.
[12:30] <Agent Neo>	+ not needing to know multiple prefixes.
[12:30] <MightyMOE>	Also the commands oofed at one point
[12:30] <MightyMOE>	Which was a big reason in removing them

From what I recall, moderation commands used to be under the Utility cog of Tartar.