Adding some traffic_calming=* presets

fixes #2400 

Quick comments:
* I'm assuming a `traffic_calming=table` always has a pedestrian crossing on it (it is commonly called a "raised pedestrian crossing" after all);
* It would be good to have a icon "bump" in the future.
* When I added `"highway":"crossing"` as the second item in the `"tags":{}` section of the file `data/presets/presets/traffic_calming/table`, the pair `"traffic_calming":"table"` didn't appear in the file `data/taginfo.json`. Is this a bug?