Server management

[Matt Cowley]

Currently the only server management command from the old bot that is implemented is the emoji command.
In addition, the role, channel and reactions commands need to be re-implemented in the new bot.
The role command should not check for the presence of an emoji when creating roles.
The channel command should still check for role but work without the need for the emoji to be present.
The reactions command should obviously check for emoji, role and channel.