Return Message object from sending functions

[TheDiscordian]

It'd be very helpful if whenever possible we returned a resulting Message object for example:

	Send(msg Message) Message
	SendText(text string) Message
	SendFormattedText(text, formattedText string) Message

I'm not completely sure how often this will be possible (depends on the protocol), but hopefully very often. This can be useful for things like sending a message and logging the unique ID of the message, or adding reactions onto it.