Prefer to pull in phone placeholder text based on the country currently
being edited. Fallback to using placeholder text based on user’s
locale settings.
rename phone placeholders to phone formats
add Germany example phone number
See [German Wikipedia article
E.123](https://de.wikipedia.org/wiki/E.123)
check for null in focus
check that input.node() is not null in i.focus()
Generate a single feature-icons.json and feature-icons.css.
In the JSON, features with a line icon are indicated by the
presence of a `line` property. PresetIcon looks for this to
determine whether or not to add the `preset-icon-line` class.
New line icons may be added by editing line-icons.json.
* Adds Marked
* Fixes a global leak in toGeoJSON
* Removes marked from package.json
* Adds documentation to core.yaml
* Removes stray console.log from tests
