osu!mapping: minor editor update -- may 2018

talking about the latest editor update for longer than anyone should, along with potential editor upkeep big thanks to this guy: the changelog: stream clip: maps referenced: sakuzyo - Neurotoxin by deetz: YURiKA - Kyoumen no Nami by deetz: CHiCO with HoneyWorks - Wolf by Kantokun: Dollscythe - Flashes (Extended) by Sk