Refactor message reply/response operations out of bot.js and into controllers, create appropriate util suite

[asyncjake]

Clear title, allows for a cleaner bot.js and less assumptions about handling the objects in particular ways. Allows easier split out of "reactAndDelete(reaction, msg)" type calls, which could be HUGE QoL improvements

Util ideas

• replyInline(msg, replyContent)
• react(msg, reaction)
• reactAndDelete(reaction, msg)
• replyPrivately(msg, replyContent)
• replyPrivatelyAndDelete(msg, replyContent)

Also, just calling function(input, msg, client) and expecting no return is perfectly fine, I don't think everything needs to be a closed loop