Avoid embedding images/tweets/videos in posts with :nws:

[nolanw]

Settings might be nice too, but default should be "don't embed if relevant smilie in post".

A quoted :nws: will turn off embedding in the quoting post. e.g. given the BBcode

[quote]
woah :nws: twitter.com/status/69
[/quote]

that's nothing look at this twitter.com/status/420

we want embed nothing.

:nms: has no effect.

[nolanw]

Done in 17e03765b112d1d3a6a20a2de8d8f2d22daa2088.