Add FAWE heightmap to Creative

[Fuglen]

As a(n) player
I want to have access to all heightmaps
So that I can use WorldEdit to build amazing things

Detailed description:
With the "Mountain 5" image and the command "//brush height "file://Mountain 5.png"" I was able to build the image below in a matter of minutes. I think heightmaps are advanced brushes that a scaleable, it keeps changing the entire mountain at all levels when I try to make it higher/smaller/wider.

Link to their demo: https://intellectualsites.github.io/HeightMap/
Link to their repo: https://github.com/IntellectualSites/HeightMap
We would need to host the simple/static website ourselves, but since when have that been an issue? :)