Add logic for tracking `drag´ events of images
Retrieve item URL correctly
Remove unused `getRandomItem´ method
Require active Datawake's domain to be set
Rename `itemDroppedInBin´ callback to `addLabel´

Also adapt function to require the right data with which to add the label
between the query content id and a (text or image) content id.
Don't require `query_content_id´ since we already know it
Add note
Log FC update request to the console

Only meant to be used in the meantime.
Add id creation and generation methods
Return updated API
Use correct semantics when referring to query content id
Remove logic specific to processing of keyboard events
Remove code specific to bin shortcut and sub-bins
Create specialised `Bin´ class for bins with images
Remove logic for dropping of items
Implement handler for processing drop events of text snippets and images
Add initial logic that handles instantiation of Bin with images
Remove item drop event logic
Correctly and safely retrieve bin
Implement special drop event handler for text snippets and images