Exclusive discord roles

[MathewBurnett]

When attaching a discord role to a ticket type it would be nice to choose between modes.

• exclusive: Manages only people with a ticket to have the role
• addition: Simply adds that role to a ticketed user

[MathewBurnett]

an example of exclusive behaviour so lets say

• mint never gets account in control
• mint is too cheap to buy a ticket
• mint trys to have fun in our event chan
• bot removes mints role in discord BUY A TICKET MINT