Adding universal config API and adding allowed/blocked country config

Common/src/main/java/dev/brighten/antivpn/utils/MiscUtils.java

@@ -1,9 +1,6 @@
 package dev.brighten.antivpn.utils;
 
-import java.io.Closeable;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.InputStream;
+import java.io.*;
 import java.lang.reflect.Method;
 import java.net.Inet4Address;
 import java.net.InetAddress;
@@ -33,6 +30,24 @@ public class MiscUtils {
         }
     }
 
+    public static void copy(InputStream in, File file) {
+        try {
+            OutputStream out = new FileOutputStream(file);
+            int lenght;
+            byte[] buf = new byte[1024];
+
+            while ((lenght = in.read(buf)) > 0)
+            {
+                out.write(buf, 0, lenght);
+            }
+
+            out.close();
+            in.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
     public static boolean isIpv4(String ip)
     {
         return ipv4.matcher(ip).matches();