Alias Nier characters

Posted under Tags

BUR #335 has been approved by @Penance.

remove alias 2b_(nier) -> yorha_no._2_type_b
remove alias 9s_(nier) -> yorha_no._9_type_s
remove alias a2_(nier) -> yorha_type_a_no._2
create alias yorha_no._2_type_b -> 2b_(nier:automata)
create alias yorha_no._9_type_s -> 9s_(nier:automata)
create alias yorha_type_a_no._2 -> a2_(nier:automata)
rename a2 -> a2_(nier:automata)

This would keep it consistent with danbooru, and also make it a bit easier on the eye.