Added External RDS Decoder option

.gitignore

@@ -243,4 +243,5 @@ paket-files/
 # JetBrains Rider
 .idea/
 *.sln.iml
-Todo.txt
+Todo.txt
+Thumbs.db

Docs/ASCII G Protocol.md

@@ -0,0 +1,29 @@
+RDS data is provided by the RDS encoder in ASCII representation in this format:
+```"G:"+#13+#10+"AAAABBBBCCCCDDDD"+#13+#10+#13+#10```
+where
+AAAA is PI,
+BBBB is block 2,
+CCCC is block 3,
+DDDD is block 4 of the RDS group.
+
+lets decipher this a bit 
+#13 is ASCII character for CR (Clear Line (\r))
+#10 is ASCII character for LF (Line Feed (\n))
+
+so in human readable format this would look like:
+```
+G:
+AAAABBBBCCCCDDDD
+
+
+```
+or in computer form
+```G:CRLFAAAABBBBCCCCDDDDCRLF```
+
+in C# you would write it
+```csharp
+Console.WriteLine("G:");
+Console.WriteLine("AAAABBBBCCCCDDDD");
+Console.WriteLine();
+Console.WriteLine();
+```

Recievers-I-Use.txt

@@ -0,0 +1,3 @@
+sdr://188.25.106.73:5555/ - Romania - Stations from Romania and Bulgaria receivable on 100.5 Rock FM in IBOC, It can also be seen in the README
+sdr://212.139.208.227:5555/ - UK (Kent) - Stations from UK and France stations receivable
+sdr://212.187.114.164:5556/ - UK (someLW and MW only) --- 747khz MCB Radio from The Netherlands is good choice for listening at daytime :)

SDRSharp.XDR/AdvancedRDSWindow.cs

@@ -7,14 +7,67 @@
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using System.Threading;
+using SDRSharp.XDR.Tools;
 
 namespace SDRSharp.XDR
 {
     public partial class AdvancedRDSWindow : Form
     {
-        public AdvancedRDSWindow()
+        private static AdvancedRDSWindow form2;
+        ToolTip toolTip1 = new CustomToolTip();
+        private AdvancedRDSWindow()
         {
             InitializeComponent();
         }
+
+        public static AdvancedRDSWindow Instance
+        {
+            //singleton design pattern to return always the same instance of a form
+            get
+            {
+                if (form2 == null || form2.IsDisposed)
+                {
+                    form2 = new AdvancedRDSWindow();
+                    form2.Text = "Advanced RDS Settings";
+                    form2.NonClientMouseHover += form2.TitleHoveredEvent; //Hook into TitleHover event
+                    if (!XDRPlugin.ExternalRDS)
+                        form2.internalrds.Checked = true;
+                    else
+                        form2.rdsspy.Checked = true;
+                }
+                return form2;
+
+            }
+        }
+        private void TitleHoveredEvent(object sender, EventArgs e)
+        {
+            toolTip1.Show("You found the easter egg", this, 0, -100, 10000); //I have to write something as text otherwise tooltip won't appear
+        }
+        private void rdsspy_CheckedChanged(object sender, EventArgs e)
+        {
+            //Enable adress,port control if we are using External RDS Source
+            UDPListen.Enabled = true;
+            textBox1.Enabled = true;
+            textBox2.Enabled = true;
+            XDRPlugin.ExternalRDS = true;
+        }
+        private void internalrds_CheckedChanged(object sender, EventArgs e)
+        {
+            //Disable adress,port control if we are using Internal RDS Source
+            UDPListen.Enabled = false;
+            textBox1.Enabled = false;
+            textBox2.Enabled = false;
+            XDRPlugin.ExternalRDS = false;
+        }
+
+
+        private void UDPListen_Click(object sender, EventArgs e)
+        {
+            UDPServer.listenPort = Convert.ToInt32(textBox2.Text);
+            Thread RecieveUDP = new Thread(UDPServer.Serve);
+            RecieveUDP.Start();
+            RecieveUDP.IsBackground = true; //if this is not true we won't be able to close the SDR# because this will keep running and we don't want that
+        }
     }
 }