[Raffle] - Allow for a non-interactive setup

[kyle95wm]

I'll re-iterate what I said on Discord below:

Allow for a non-interactive mode so one can do something like:
-raffle start <length> <title> <Description> <number of winners> [days in server] [role]

This way, one can put something like this into a schedule and have it fire off at a designated time to help with time-sensitive giveaways. Is this doable?

Perhaps this could either be worked into the existing raffle command or could be its own separate thing.

In addition: I would imagine if one wanted to just define a role, and not care about days in server, then if the 6th argument is not a number, it will be set to 0 and be shifted to the 7th argument