WatchWolf v0.3 comes with major stability fixes!

• WatchWolf-ServersManager has been completely refactored into Java. Now it launches servers faster, provides more stability, and gives more verbose errors (and even logs!)
• The tests now are less flaky: testing a game is hard, and a lot of things can go wrong. That's why I've decided to:
  1. Set the default difficulty back to peaceful (no more Slimes killing the player, pushing it, or being in the middle of a block!). Still, you can change it with the corresponding command.
  2. Set a world seed: By fixing the same world every time we reduce unexpected things happening. You can set your own seed, or set it random (empty string; ""). By default, the seed is always "1".

Now you can view tests by specifying the `recordings-directory` parameter, and some bugs were solved.

Added new features and solved some script problems

Solved problems and added more servers compatibility.