Feature Request: Add support for Material Design Icons

[huy-vuong]

It's really great that this plugin works with a lot of different icon sets. Another icon set that also has a rich variety of icons free of charge is Material Design Icons.

Why this icon set?

In particular it has a lot of free icons that would be useful for place-specific icons, like a glass of beer, a coffee mug, a chicken drumstick, symbols for halal or kosher foods, etc.

For a map, this would make it easier to have more specific icons representing certain kinds of places. For example: Places that sell croissants for example could use food-croissant.

The current iconset supports Material Icons. Why this one?

Material Design Icons is a community-maintained superset of the official Material Icons. It adds more (shown on that website as orange-squared boxes).