Update to address defect with processStandardItem.
Correction to handle and issue raised with 'Once the sell_in days is less then zero, quality degrades twice as fast (positive sell_in value, quality: 20-->19)'.
Refactor to move quality calculations out of the processing functions as its business logic is becoming complex.
Refactor
Updates to address the remaining bahavior for 'Backstage passes'.
Update for 'Conjured' items