feature: fix sponge shutdown timer

Adds a new config entry serverStopTimeout. That config entry allows you to specify the time the server should be alive after the server stops.

The previous version had a bug, where sponge did not properly track server stops.

feature: add shutdown timer and fix paper ontick

Adds a new config entry serverStopTimeout. That config entry allows you to specify the time the server should be alive after the server stops.

This version has a bug, where sponge does not properly track server stops. So this version doesn't change anything there.

feature: use jdk9 ProcessHandle if available

If the jdk9 ProcessHandle api is available, it will be used to kill the server pid.

This release internally completely changes how the DeadLockDetector plugin is built.
Individual artifacts are now available on https://nexus.c0d3m4513r.com/ (their source code is also published there are a .jar, but the tags in github corrospond to the releases published).

This commit also adds some MultiCraft support (the support is not as good as that of other panels).

Before this commit you always had two shutdown mechanisms working at once: My Plugin trying to shutdown the server, and the panel doing the same.
Now you can specify what should happen first, and how long each action should be apart.
This is controlled with the pluginOffset config key.

fix: uuid not getting updated correctly

Grabbing the location of the plugin .jar file sometimes failed.
A backup-method was added, to be used in-case the first method fails.

Bug Fixes
- Don't print sensitive values
- Don't replace the UUID, if it gets replaced by nothing.

Features
- Also print Thread Status on thread dump

This version fixes a bug, where if the path to the plugin jar contained spaces, it would break the plugin and spam the console.

Also config files on bukkit should get initialised correctly now.

v0.1.10 had a bug, that caused the plugin to never send panel requests.
This has now been fixed. There are only implementation changes.

There have been some major changes with this version. The short version is that I have added another way to detect when the Server freezes and another way to restart the server (without needing to kill it outright at first). I also added more Config options.

I highly recommend, that you grab the new config files (or let then generate via renaming the old ones).

This update changes how commands are internally processed.
No functionalty should have been changed, added or removed from v0.1.6 to v0.1.7 and v0.1.8, since v0.1.7 was just a simple version bump, so I can upload my plugin to sponge ore, and v0.1.7 is the command refactor.