Support for Minecraft 1.14

As promised, this is the first development build with technical support for Minecraft 1.14.x. This means technical inclusion and consideration of 1.14.x features are present, but the current performance of Spigot 1.14.x (regardless if it's Spigot's or Mojang's problem) if it comes to world loading and crash bugs make it impossible to guarantee the same quality as with 1.13.x in practice.

I had to add a workaround for a bug where portals in 1.14 sometimes loaded instances twice, and it took >20 seconds on my machine to load a tiny, simple flat world with nothing but a ready and end sign - >20 seconds where a server would be entirely frozen. Fortunately, a new performance improvement makes this at least a bit less bad in 1.14 and actually good in the older versions. I'm also sounding out some alternatives like asynchronous world loading (which used to be a feature in DungeonsXL until the method I used to use broke) or programming a custom world loader where some performance is gained by leaving out features that are not necessary in dungeons, but the best bet is to hope for performance improvements in 1.14.3.

If you'd like to try it out, please let me know how your experience with performance in 1.14 is and if there are any issues and how frequent they are.

Update policy
This build is a development build. That means that it is not only not as stable as release builds but also that its features are always subject to change. Features in development builds might be removed or changed without automatical data converters in a following build. The builds posted here are only builds from the master branch.

The reason why the old branch (0.17) wasn't updated is that the changes made to the project setup in order to support Minecraft 1.14 are rather far reaching, and they coincidenced with the API updates for 0.18. 0.18 is supposed to become a major feature update once it's ready that was and is developed independently of Minecraft updates - that means even if there is this early dev build, it will still take a while until it is finished.

Donations
Thank you once more very much to those who donated - I received more than ever before within the last weeks and it was a huge motiviation C:

Changelog
0.18:

• New features:
  • Updated to Minecraft 1.14.2
  • World loading performance improvements
  • Improved directions util (support for e.g. NNE for north-northeast)
• Changes:
  • DungeonsXL now depends on the Spigot API, not Bukkit
  • Updated to Commons 6
  • Switched GUI library to Vignette
  • New legacy support system
  • Code improvements and modernizations for 1.13 and 1.14
• Bugfixes:
  • Fixed worlds being loaded twice at the same time (1.14)
• Removed features:
  • Everything related to chunk loading

0.17.8: