* Added ability to cancel events * Made more events cancellable * Added event_priority to __config * Check for string values for performance * Made player_finishes_using_item cancellable * Made player_chooses_recipe cancellable * Made player_swaps_hands cancellable * Made player_message cancellable * Added __on_player_placing_block (#1498) * Added event to docs, keywords, event_test * Added docs for event cancellation