[For 1.6] Hide Content Until Reply 2.0

[Whiteneo]

Well everyone can use the hide tags, but on cofiguration you can add who can view contents without reply, this task is to review if is the case the content to validate or not this tags.

You can add usergroups by id to see contents without have to reply a thread.

And if you are the owner of a thread you can quote contents, and if you have replied to the thread can quote too.

But if you don't you can't quote hidden contents, well only urls and hide tags, because attachment can't be quoted.

I tested on some parts of MyBB, and works fine.