Bot interaction: get status of own world(s)

Respond to a DM'd command of !status with:

• The world name and game
• The number of items with known priorities in the game Split out to #32 (closed), possibly superseded if looking at items in world context (below) is enough info
• The number of item priority overrides for the world Split out to #33 (closed)

Only include worlds that are known as "registered" to user.

Respond to a DM'd command of !status <world> with:

• The items with known priorities for the world's game, including overrides in place for that specific world

Respond with an error message if the requested world is not "registered" to that player.