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cded42349f
This PR removes unnecessary `ramp` tagging from the `transportation` layer. The `ramp` tag is used for two situations. First, it is set for all `highway=***_link` tags to indicate a highway ramp. The second situation is when the `ramp` tag is set on a highway object, which indicates the presence of a ramp, such as one that would be used for a wheelchair. `ramp=0` is a reasonable default in these situations; by removing cases of `ramp=0` and presenting only `ramp=1` to the tiles, we can save considerable size in the tiles. Additionally, there appears to be a bug in which all objects tagged `highway=steps` are inexplicably tagged `ramp=1`. The changes as follows: 1. Remove `ramp=0` where it appears in the tile. 2. `highway=steps` no longer assumes `ramp=1` in cases where `ramp=*` is not explicitly set. In the current behavior, `ramp=0` is tagged only in at z13+ but suppressed in lower zooms:    This PR unifies `ramp=0` suppression between z13+ and z12-.
