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_client.cpp

@@ -0,0 +1,86 @@
+#include <frnetlib/TcpSocket.h>
+#include <frnetlib/TcpListener.h>
+
+#define SERVER_IP "127.0.0.1"
+#define SERVER_PORT "8081"
+
+
+int send_a_packet(fr::TcpSocket &socket)
+{
+    std::cout << "Going to send something..." << std::endl;
+
+    //Send the request
+    fr::Packet packet;
+    packet << "Hello there, I am " << (float)1.2 << " years old";
+    if(socket.send(packet) != fr::Socket::Success)
+    {
+        //Failed to send packet
+        std::cout << "Seems got something wrong when sending" << std::endl;
+        return -1;
+    }
+
+    //Receive a response
+    std::cout << "Waiting for a response..." << std::endl;
+    if(socket.receive(packet) != fr::Socket::Success)
+    {
+        std::cout << "Failed to receive server response!" << std::endl;
+        return -2;
+    }
+
+    //Extract the response, you can surround this in a try/catch block to catch errors
+    std::string str1, str2;
+    float age;
+    packet >> str1 >> age >> str2;
+    std::cout << "Server sent: " << str1 << ", " << age << ", " << str2 << "\n\n\n" << std::endl;
+    return 0;
+}
+
+
+int main()
+{
+
+    //Try and connect to the server, create a new TCP object for the job and then connect
+    fr::TcpSocket socket;  //Use an fr::SSLSocket if SSL
+    if(socket.connect(SERVER_IP, SERVER_PORT) != fr::Socket::Success)
+    {
+        //Failed to connect
+        std::cout << "Failed to connect to: " << SERVER_IP << ":" << SERVER_PORT << std::endl;
+        return -1;
+    }
+
+    //For storing user input and send_a_packet response
+    std::string op_str;
+    int rtn = 0;
+
+    //Keep going until either we, or the server closes the connection
+    while(true)
+    {
+        //Ask the user what to do
+        std::cout << "Choose what you want to do, `c` for `continue`, `q` for `quit`:" << std::endl;
+        std::cin >> op_str;
+        if(op_str.length() > 1)
+        {
+            std::cout << "Seems that you inputted more than one character, please retry." << std::endl;
+            continue;
+        }
+
+        switch(op_str[0])
+        {
+            case 'c':
+                std::cout << "continue" << std::endl;
+                rtn = send_a_packet(socket);
+                break;
+            case 'q':
+                break;
+        }
+
+        //Exit/error check
+        if(op_str[0] == 'q')
+            break;
+        if(rtn != 0)
+            break;
+    }
+    
+    std::cout << "All done, bye!" << std::endl;
+}
+