Add Quest: roof:material

[ravenfeld]

I'm going to split the request in 2.
#443

Creating a quest to add roof material

The most complicated part is making the images once you understand how it works ;)

[Helium314]

Similar to builing material quest: please reduce size of the images, it's more than 5 MB currently, and the strings could be re-used (after building material quest is merged).
Other than that it's mostly minor things:

• not sure if tin and generic metal should be separate. I wouldn't be able to tell that a roof is made of tin, probably same for zinc. But maybe it's easy if you have some experience.
• I found the concrete and tar paper images not really helpful. For tar paper, just some increased contrast might help a lot (and maybe for concrete too)
• the asphalt image looks strange, on my phone at first I thought it was a lake
• quest icon could be nicer, but at the same time making a nice looking tile roof or whatever seems to be not worth the effort