Add delay to property inspector dropdowns (and include search form)

[sid]

New topic created since this has been marked as complete:

Bring Back Search For Dynamic Attribute & Events Picker

Continuing the discussion from Add delay to property inspector dropdowns (and include search form) because Teodor marked it as completed: Summary: With version 5, the visual pickers which used to have a simple search for adding events and attributes along with limited keyboard support, have been replaced with Mouse-only menu/sub-menu UI