add "me" macro autofilled placeholder
unstub "op/op_username" macro autofilled placeholder
{{op}} is first user in PM/modmail thread or OP on comments page
{{reply_to}} or {{reply_to_username}} is /u/username of comment replying to or OP
commentTools.magicPlaceholders array instead of switch
Refactor commentTools magicPlaceholders description into each placeholder
: > .
Merge pull request #1250 from andytuba/macro-placeholder-unstub

Macro placeholders for OP, reply_to, me