Brian Sperlongano 45d825e212
Implement private road tagging (#1174)
Fixes #1066 

This PR adds a new field `access` in the transportation layer, which will be set to `no` if the `access` tag is either `no` or `private`.  While `private` is the more popular value by a 17:1 ratio, I went with `no` because it's smaller in the tiles.  In addition, the text `no` opens up the future possibility of other text-based access values such as `destination`, `customers`, or `permit`.

The screenshot below shows an example of access tagging for a road on a military base:

![image](https://user-images.githubusercontent.com/3254090/129431491-9acbaeca-bf18-4384-8177-2c198834865c.png)
2021-08-14 07:04:17 +02:00
..
2020-11-24 12:27:06 +02:00
2021-01-08 15:44:11 +01:00