Add /schedule Group

[Quantam-Studios]

The '/schedule' group will have the following features:

• /schedule reminder (will not be added.)
  • Premium 30 | 1
  • Add /schedule reminder
• /schedule message [message] [channel]
  • Premium ∞ | 1
  • [x] Add DB table for messages.
  • [x] Add /schedule message
• /schedule announcement [title] [description] [color]
  • Premium ∞ | 0
  • [x] Add DB table for announcements.
  • [x] Add /schedule announcement
• [x] Add /schedule edit [id]
• [x] Add everything to docs.
• [x] Add rate-limit prevention, and per-user caps.