[Tagging] Remove non-prefixed versions of 'contact:' scheme

[Luke Marlin]

I read the previous iteration of that discussion, and it left me with a
sour taste. The community was _not_ welcoming and made me reconsider my
view of OSM. People opposing the idea were often harsh, and arguments
were buried under piles of unpleasant-ness.

Now, I've read that iteration (all messages), and even though Paul
Allen looked slighty sarcastic/irritated at the end, he did a better
job at convincing me why this might not be a good idea because he
carefuly replied to points, and made some sensible ones as well.

So yeah, basically, what I wanted to say is thank you Paul for all you
wrote, your messages helped me understand another point of view and
showed me that this list could indeed be used to have actual
discussions between users.

On the topic itself, I still like the idea of having hierarchized tags,
but as it's been shown it might not easily apply here and probably
isn't worth the effort of applying a new scheme.
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