Does some much needed cleanup, adds the Paper server type and fixes broken downloads

src/test/java/net/knarcraft/minecraftserverlauncher/userinterface/FakeGUI.java

@@ -0,0 +1,16 @@
+package net.knarcraft.minecraftserverlauncher.userinterface;
+
+public class FakeGUI extends MessageHandler implements GUI {
+
+    /***
+     * Initializes a new fake gui
+     */
+    public FakeGUI() {
+        super(true);
+    }
+
+    @Override
+    public void printMessageToGUI(String message) {
+        System.out.println(message);
+    }
+}