Dev: Testing

[TylerBloom]

Description
There is currently no systemic way of performing testing since spoofing the state of the discord client is difficult. This might not be necessary. Instead, a !test command that can be run only by bot admins can be added. The arguments to a command can be created easily (see here) and read in from a file. From there, the Context and Message can be used used as a proxy for calls to the other commands.

Note: This can't really be used in a CI environment. But it's better than nothing, and more stable that spoofing the client.