heisluft

Implemented this pr in my fork

The original project is stale as of 2015. [My Fork](https://github.com/AntiLaby/jsemver) has that and other features implemented.

> I'm going to hold off on this PR until after we make the spawning code less miserable. Have you yet started working on / thinking about the rewrite? Just...

I implemented PlayerLocaleChangeEvent in #1011

Any updates on this issue?

This is where I'm at now [State of development](https://heisluft.tk/gh/GlowstoneMC/Glowstone/pr_1024_01.mp4)

[Next sneak peak](https://heisluft.tk/gh/GlowstoneMC/Glowstone/pr_1024_02.mp4) (chance of zombie pigman spawning increased by 1000% to shorten video length :))

My take on this is that each GlowWorld registers one TravelAgentImpl which then deals with portal implementation. This also would allow us to handle Portal gen in the overworld -...

I’m sorry, I kind of lost track of this PR. After loosing some of my work to faulty git usage of mine I lost motivation to actually finish this PR....

[Next (And probably last sneak peak)](https://heisluft.tk/gh/GlowstoneMC/Glowstone/pr_1024_03.mp4). I decided not to check wheter the bounding box of the portal block intersects the one of the player for now, so players get...