Add KCP support (#788)

Add KCP support for shadowsocks.

KCPTUN should be setup on a different port to avoid conflicts with Shadowsocks' UDP support.

src/main/scala/com/github/shadowsocks/database/Profile.scala

@@ -99,6 +99,15 @@ class Profile {
   @DatabaseField
   var userOrder: Long = _
 
+  @DatabaseField
+  var kcp: Boolean = false
+
+  @DatabaseField
+  var kcpPort: Int = 8399
+
+  @DatabaseField
+  var kcpcli: String = ""
+
   override def toString = "ss://" + Base64.encodeToString("%s%s:%s@%s:%d".formatLocal(Locale.ENGLISH,
     method, if (auth) "-auth" else "", password, host, remotePort).getBytes, Base64.NO_PADDING | Base64.NO_WRAP)