gradle: Add tasks to remove Javacc output dirs
gradle: Add tasks to remove Javacc output dirs

workcraft/workcraft,workcraft/workcraft,tuura/workcraft,danilovesky/workcraft,jrbeaumont/workcraft,danilovesky/workcraft,workcraft/workcraft,workcraft/workcraft,tuura/workcraft,danilovesky/workcraft,jrbeaumont/workcraft,danilovesky/workcraft,tuura/workcraft,jrbeaumont/workcraft