Add left/right driving side data

[quincylvania]

Re: #4

We can replace this file: https://github.com/openstreetmap/iD/blob/v2.16.0/data/drive-left.json

List of regions: https://en.wikipedia.org/wiki/Left-_and_right-hand_traffic#Worldwide_distribution_by_country

[quincylvania]

Turns out the iD file incorrectly classifies some features like the British Indian Ocean Territory and Saint Martin. This stuff will be easier to catch and correct with country-coder since it's encoded as a property instead of a geometry.