Refactor out wesnothd_connection_ptr wrapper class

Just used the shared_ptr directly. The wrapper basically duplicated the functionality of shared_ptr.
This also adds moves the stop() call to the wesnothd_connection dtor instead of the wrapper class.

src/game_initialization/multiplayer.cpp

@@ -64,7 +64,7 @@ static wesnothd_connection_ptr open_connection(CVideo& video, const std::string&
 		h = preferences::network_host();
 	}
 
-	wesnothd_connection_ptr sock;
+	wesnothd_connection_ptr sock(nullptr);
 
 	const int colon_index = h.find_first_of(":");
 	std::string host;
@@ -120,7 +120,7 @@ static wesnothd_connection_ptr open_connection(CVideo& video, const std::string&
 				throw wesnothd_error(_("Server-side redirect loop"));
 			}
 			shown_hosts.insert(hostpair(host, port));
-			sock = wesnothd_connection_ptr();
+			sock.reset();
 			sock = gui2::dialogs::network_transmission::wesnothd_connect_dialog(video, "redirect", host, port);
 			continue;
 		}

src/wesnothd_connection.cpp

@@ -373,33 +373,18 @@ bool wesnothd_connection::receive_data(config& result)
 
 wesnothd_connection::~wesnothd_connection()
 {
-	MPTEST_LOG;	
+	MPTEST_LOG;
+	stop();
 }
 
-//  wesnothd_connection_ptr
-
-
-wesnothd_connection_ptr& wesnothd_connection_ptr::operator=(wesnothd_connection_ptr&& other)
-{
-	MPTEST_LOG;
-	if(ptr_) {
-		ptr_->stop();
-		ptr_.reset();
-	}
-	ptr_ = std::move(other.ptr_);
-	return *this;
-}	
+//
+//  wesnothd_connection_ptr generator
+//
 
 wesnothd_connection_ptr wesnothd_connection::create(const std::string& host, const std::string& service)
 {
-	//can't use make_shared becasue the ctor is private
-	return wesnothd_connection_ptr(std::shared_ptr<wesnothd_connection>(new wesnothd_connection(host, service)));
-}
-
-wesnothd_connection_ptr::~wesnothd_connection_ptr()
-{
-	MPTEST_LOG;
-	if(ptr_) {
-		ptr_->stop();
-	}
+	// We can't use std::make_shared here since the wesnothd_connection ctor 
+	// is private since we want only this function to be able to create a
+	// new wesnothd_connection object.
+	return wesnothd_connection_ptr(new wesnothd_connection(host, service));
 }

src/wesnothd_connection.hpp

@@ -41,7 +41,8 @@ namespace boost
 }
 
 class config;
-class wesnothd_connection_ptr;
+
+using wesnothd_connection_ptr = std::shared_ptr<class wesnothd_connection>;
 
 /** A class that represents a TCP/IP connection to the wesnothd server. */
 class wesnothd_connection : public std::enable_shared_from_this<wesnothd_connection>
@@ -56,7 +57,7 @@ class wesnothd_connection : public std::enable_shared_from_this<wesnothd_connect
 	/**
 	 * Constructor.
 	 *
-	 * May only be called via wesnothd_connection_ptr
+	 * May only be called by @ref create (or another function of this class).
 	 * @param host    Name of the host to connect to
 	 * @param service Service identifier such as "80" or "http"
 	 */
@@ -160,48 +161,3 @@ class wesnothd_connection : public std::enable_shared_from_this<wesnothd_connect
 	std::size_t bytes_read_;
 
 };
-
-class wesnothd_connection_ptr
-{
-private:
-	friend class wesnothd_connection;
-	wesnothd_connection_ptr(std::shared_ptr<wesnothd_connection>&& ptr)
-		: ptr_(std::move(ptr))
-	{}
-public:
-
-	wesnothd_connection_ptr() = default;
-
-	wesnothd_connection_ptr(const wesnothd_connection_ptr&) = delete;
-	wesnothd_connection_ptr& operator=(const wesnothd_connection_ptr&) = delete;
-#if defined(_MSC_VER) &&_MSC_VER == 1800
-	wesnothd_connection_ptr(wesnothd_connection_ptr&& other) : ptr_(std::move(other.ptr_))  {}
-#else
-	wesnothd_connection_ptr(wesnothd_connection_ptr&&) = default;
-#endif
-	wesnothd_connection_ptr& operator=(wesnothd_connection_ptr&&);
-
-	~wesnothd_connection_ptr();
-
-	explicit operator bool() const {
-		return !!ptr_;
-	}
-	wesnothd_connection& operator*() {
-		return *ptr_;
-	}
-	const wesnothd_connection& operator*() const {
-		return *ptr_;
-	}
-	wesnothd_connection* operator->() {
-		return ptr_.get();
-	}
-	const wesnothd_connection* operator->() const {
-		return ptr_.get();
-	}
-	wesnothd_connection* get() const {
-		return ptr_.get();
-	}
-
-private:
-	std::shared_ptr<wesnothd_connection> ptr_;
-};