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/main/java/net/knarcraft/minecraftserverlauncher/profile/Profile.java

@@ -8,7 +8,7 @@ import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;
 
 import javax.naming.ConfigurationException;
 import javax.swing.*;
-import java.io.*;
+import java.io.IOException;
 import java.util.ArrayList;
 
 /**
@@ -230,7 +230,9 @@ public class Profile {
      */
     public static Profile fromString(String profileString) throws ConfigurationException {
         Profile profile;
-        if (profileString.contains("?")) {
+        if (profileString.equals("")) {
+            return null;
+        } else if (profileString.contains("?")) {
             String[] data = profileString.split("\\?");
             String[] profileData = data[0].split(";", -1);
             profile = parseProfile(profileData);