Fix selfbot permissions and replace embeds with codeblocks

[outmaneuver]

Replace embeds with well-formatted codeblocks and add permission checks for sending messages.

• HelpCog:

  • Replace embeds with well-formatted codeblocks in help_command method.
  • Add check for user permissions to send messages before sending.

• AvatarHistoryCog:

  • Add check for user permissions to send messages before sending.

• NameHistoryCog:

  • Add check for user permissions to send messages before sending.

• CurrentAvatarCog:

  • Add check for user permissions to send messages before sending.

• CustomActivityCog:

  • Add check for user permissions to send messages before sending.

• ModerationCog:

  • Add check for user permissions to send messages before performing actions.

• AutoReactCog:

  • Implement autoreact functionality with !react command.
  • Store user IDs and emojis for autoreacting.
  • Add ratelimiter to avoid getting ratelimited for reacting too fast.

• ListCog:

  • Implement list functionality to return users enabled for autoreacting.

• ReactStopCog:

  • Implement reactstop functionality to stop reacting for a user.

• Permissions:

  • Add a global decorator to check user permissions to send images, messages, or use external emotes.