Set up smashable paved bridges

These are for use in world gen, although the code isn't there yet. Some adjusting on the bashing numbers may be needed, as this is an entire tile of bridge being bashed down.
Update terrain.json

Fix json errors
Bridges operational.

I widened it up a bit to account for the sidewalk and ensure enough room for the Semi, fixed some JSON, and deleted the shallow-variants as we don't check for that.  Sorry, jokermatt999.

Bash values could probably be lowered a bit before merging, but that's not quite my call anymore.  ;-)  C4 and the tankbot gun shoud do a bit more damage IMO.
Rather an update here too.

Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA into MB2

Conflicts:
	data/json/terrain.json
Delete Git artifact, grr.
Merge branch 'MB2' of github.com:KA101/Cataclysm-DDA into KA101-MB2
Merge branch 'KA101-MB2'
Fixing missing type id in terrain.json.

Looks to be another case of Git devouring a line of code.