Add certain event hooks to discord

[Sakimori]

User-defined events on a per-league basis

[valuminumbandit]

exciting!!! ideas for events:

• [x amount of time passes]
• [trigger randomly]
• [team scores X runs in single game]
• [team is losing by X runs]
• [team is winning by X runs]
• [team A beats team B for the xth time]

[Sakimori]

Feature name: League Rules