Unofficial Touhou Alternate Forms

BUR #29198 has been approved by @nonamethanks.

create implication sakura_daiyousei -> daiyousei
create implication sakura_cirno -> cirno
create implication mizu_cirno -> cirno
create implication hapa_cirno -> cirno
create implication ikazu_cirno -> cirno

topic #28075, but for unofficial characters as suggested by forum #295641

This bulk update request is pending automatic rejection in 5 days.

Besides the other two BURs open simultaneously not getting strong reasons I think this one still could be approved, as achi cirno already implies cirno as an "variant cirno"

The bulk update request #29198 (forum #295684) has been approved by @nonamethanks.