Rename cycleway to directionalCombo

[tordans]

Following the update in iD (https://github.com/openstreetmap/iD/pull/9423/files#diff-b3604385ed7e095c6c6fd1973a4c3d376f21e56f26452299a358d033411a38f6R65-R67) this changes the name of the field to make it reusable.

AFAIK this is all that needs to happen in this repo, right?

• todo: Update version and date in Changelog.

Fixes #79

[tyrasd]

Update version and date in Changelog.

I'll do this before I package this into a release.

[tyrasd]

FYI: in 2714c23, I tweaked this one last time:

directionalCombo field: split keys into key and keys

• key is for the common version of the tag (e.g. *:both)
• keys is for the directional subtags (e.g. *:left / *:right)

for example, this is how the cycleway field looks now:

{
    "type": "directionalCombo",
    "label": "Bike Lanes",
    "key": "cycleway",
    "keys": [
        "cycleway:left",
        "cycleway:right"
    ],
  …
}

This is to make the implicit distinction between the common and directional subtags a bit more explicit (compared to relying on implicit order in keys).