This makes it easier for downstream projects (forks) to replace the
version fetching system with their own. It is as simple as implementing
an interface and overriding the default implementation of
org.bukkit.UnsafeValues#getVersionFetcher()
It also makes it easier for us to organize things like the version
history feature.
Lastly I have updated the paper implementation to check against the site
API rather than against jenkins.
Resolves#1672
This API is intended to expose useful heightmaps found in the server to API. This exposes all of the live world heightmaps currently in the server.
If a heightmap becomes impossible to implement, api spec allows the implementation to throw UnsupportedOperationException (far better than returning some weird unexpected value).
Tested via:
https://gist.github.com/Spottedleaf/5d47f67c55a9fb870251ff344bfeb6b3
