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

src/test/java/net/knarcraft/minecraftserverlauncher/DownloadTests.java

@@ -1,15 +1,17 @@
 package net.knarcraft.minecraftserverlauncher;
 
-import net.knarcraft.minecraftserverlauncher.server.ServerType;
+import net.knarcraft.minecraftserverlauncher.userinterface.FakeGUI;
+import net.knarcraft.minecraftserverlauncher.utility.JarDownloader;
 import org.junit.Test;
 
-import javax.naming.ConfigurationException;
+import java.io.File;
 import java.io.IOException;
 
 public class DownloadTests {
     @Test
-    public void downloadJarsTest() throws ConfigurationException {
-        ServerType.loadServerTypes();
-        //Profile.downloadJars();
+    public void downloadJarsTest() throws IOException {
+        String targetDirectory = Main.getApplicationWorkDirectory() + File.separator +  "files" + File.separator + "testjars" + File.separator;
+        JarDownloader downloader = new JarDownloader(new FakeGUI(), targetDirectory);
+        downloader.downloadJars();
     }
 }

src/test/java/net/knarcraft/minecraftserverlauncher/Tests.java

@@ -1,20 +1,14 @@
 package net.knarcraft.minecraftserverlauncher;
 
 import net.knarcraft.minecraftserverlauncher.profile.Profile;
-import net.knarcraft.minecraftserverlauncher.server.ServerType;
 import org.junit.Test;
 
-import javax.naming.ConfigurationException;
 import java.io.FileNotFoundException;
 
-import static net.knarcraft.minecraftserverlauncher.Shared.stringBetween;
+import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.stringBetween;
 import static org.junit.Assert.assertEquals;
 
 public class Tests {
-    @Test
-    public void loadServerVersions() throws ConfigurationException { //Make sure the server versions file has correct syntax
-        ServerType.loadServerTypes();
-    }
 
     @Test
     public void saveProfile() throws FileNotFoundException { //Make sure we can write profiles to disk

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);
+    }
+}