Drawing icons
**Describe the requested icon**
It would be nice to have drawing-related icons : I'm building an app where people can trace shapes on a map and I came with these manually drawn icons (screenshot):
The downside of these is:
- They don't really fit with other phosphor icons
- They are SVGs, inlined in an `img` tag thus don't support color variations

Basically, I'd like the following icons:

- polygon shape
- multi-line shape

I haven't seen a way to combine icons (e.g.: a `ph-map-pin` with an upper `ph-plus`), these variants are welcome:

- ph-map-pin +
- ph-circle +
- polygon +
- multi-line +

**Screenshots**
![image](https://user-images.githubusercontent.com/1732268/114234834-9a169680-997f-11eb-8e79-f470446a24c2.png)

**Additional context**
If you're interested to add these and want a base, the [sources are available](https://gitlab.com/experimentslabs/garden-party/garden-party/-/tree/develop/public/ui). (I see there are some more outdated ones from when I wasn't yet using Phosphor :) )

I can also make a PR with an attempt to match your design.

Thanks for the good work, your set is refreshing :)
