/sticker and /nosticker command

[Happy-Ferret]

Implement a /sticker command to display a sticker's ID and the set it belongs to.

Implement a /nosticker command to disable stickers or sticker sets.

/sticker

• Add and register command handler.
  • Command list scope: All
• Add sticker ID.
• Add stickerset the sticker belongs to.

/nosticker

• Add and register command handler.
  • Command list scope: Admins & Owner
• Args: Solo to disable one sticker instead of entire set.

[Happy-Ferret]

Ship /sticker with 0.0.6
/nosticker will be shipped as part of the 0.1.0 milestone, when @PuddingBot has gained persistence.