Adds various fixes to make the two java versions work as expected

Makes it possible to load a controller without generating a GUI, for better testing
Makes sure not to try and parse empty profile lines
Saves controller settings in a more readable and appendable format
Adds code for using the correct java version for the occasion
Adds a new function for writing to files

src/test/java/net/knarcraft/minecraftserverlauncher/server/ServerTypeHandlerTest.java

@@ -4,7 +4,6 @@ import net.knarcraft.minecraftserverlauncher.server.servertypes.ServerType;
 import org.junit.jupiter.api.Test;
 
 import javax.naming.ConfigurationException;
-
 import java.util.Arrays;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;

src/test/java/net/knarcraft/minecraftserverlauncher/server/ServerVersionContainerTest.java

@@ -5,7 +5,10 @@ import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 
 import static net.knarcraft.minecraftserverlauncher.utility.CommonFunctions.createAllFolders;
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -35,14 +38,14 @@ public class ServerVersionContainerTest {
         serverVersionContainer.reset();
         System.out.println(serverVersionContainer.toString());
         assertEquals("vanillaVersion;null\nsnapshotVersion;null\nbungeeVersion;null\nwaterfallVersions;\n" +
-                        "travertineVersions;\nspongeVanillaVersions;\nspongeForgeVersions;",
+                        "travertineVersions;\nspongeVanillaVersions;\nspongeForgeVersions;\ndownloadedBuildToolsVersion;null",
                 serverVersionContainer.toString());
     }
 
     @Test
     public void saveStateTest() throws IOException {
         serverVersionContainer.saveState();
-        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(versionFile)));
+        BufferedReader reader = CommonFunctions.getFileReader(versionFile);
         String savedData = CommonFunctions.readBufferedReader(reader);
         reader.close();
         assertEquals(serverVersionContainer.toString(), savedData);

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarBuilderTest.java

@@ -1,14 +1,17 @@
 package net.knarcraft.minecraftserverlauncher.utility;
 
 import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
 import net.knarcraft.minecraftserverlauncher.userinterface.FakeGUI;
 import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.MethodOrderer;
 import org.junit.jupiter.api.Order;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestMethodOrder;
 
+import javax.naming.ConfigurationException;
 import java.io.File;
 import java.io.IOException;
 
@@ -22,6 +25,15 @@ public class JarBuilderTest {
     private static String targetDirectory;
     private static String jarDirectory;
 
+    @BeforeAll
+    public static void preSetUp() {
+        try {
+            ServerLauncherController.getInstance().loadState(true);
+        } catch (ConfigurationException | IOException e) {
+            e.printStackTrace();
+        }
+    }
+
     @BeforeEach
     public void setUp() {
         targetDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +