Added support for examples to the build system. Cleaned up examples.

Examples can now be automatically built with the project, if enabled. And I've cleaned up MiaoDX's examples to be more compliant with frnetlib's coding style.

examples/simple_server_and_client/tcpsocket_server.cpp

@@ -0,0 +1,76 @@
+#include <frnetlib/TcpSocket.h>
+#include <frnetlib/TcpListener.h>
+#define PORT "8081"
+
+
+int main()
+{
+    //Create a new TCP socket to maintain connections, and a new Tcp Listener to accept connections
+    fr::TcpSocket client;      //fr::SSLSocket for SSL
+    fr::TcpListener listener;  //fr::SSLListener for HTTPS
+
+    //Bind to a port
+    if(listener.listen(PORT) != fr::Socket::Success)
+    {
+        std::cout << "Failed to bind to port: " << PORT << std::endl;
+        return -1;
+    }
+
+    std::cout << "Listener is listening on port: " << PORT << "..." << std::endl;
+
+    //Start accepting connections
+    while(true)
+    {
+        std::cout << "Waiting for a new connection ..." << std::endl;
+
+        //Accept a new connection
+        if(listener.accept(client) != fr::Socket::Success)
+        {
+            std::cout << "Failed to accept client, shutdown" << std::endl;
+            break;
+        }
+
+        while(true) //Infinite loop to keep the connection active
+        {
+            try
+            {
+                //Receive an fr::Packet from the client
+                fr::Packet packet;
+                if(client.receive(packet) != fr::Socket::Success)
+                {
+                    std::cout << "Failed to receive request" << std::endl;
+                    client.close_socket();
+                    break;
+                }
+
+                //Extract the data from the packet
+                std::string str1, str2;
+                float age;
+                packet >> str1 >> age >> str2;
+
+                //Print out what we got
+                std::cout << "Client sent:" << str1 << ", " << age << ", " << str2 << std::endl;
+
+                //Send back the same packet
+                if(client.send(packet) != fr::Socket::Success)
+                {
+                    throw std::string("Failed to send packet to client");
+                }
+            }
+            catch(const std::exception &e)
+            {
+                //Print out what happened
+                std::cout << "Error: " << e.what() << std::endl;
+
+                //Close connection
+                client.close_socket();
+                break;
+            }
+        }
+
+
+    }
+
+    return 0;
+}
+