…for case :left, :right, :both. The directionalCombo will show left/right in separate fields when both is present and merge/split the side as needed.
Allow tagging `parking:$side` and `parking:$side:orientation` on centerlines (highways).
The `parking:orientation` tag has three common and documented values.
Currently no other values are in common use. With `autoSuggestions`
turned on, two rare values (`orthogonal`, 80 uses, ostensibly a synonym
of `perpendicular` and `marking` with only 16 uses) are included in the
combo-box, making these seem like common and valid options.
Fixes#553.
