Implement windows 8.1+ notifications

This splits notifications up into multiple backends
currently only libnotify on unix and win8 toasts.

The win8 backend was originally written by @leeter
though heavily modified.

src/fe-gtk/notifications/notification-winrt.cpp

@@ -0,0 +1,100 @@
+/* HexChat
+ * Copyright (c) 2014 Leetsoftwerx
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string>
+#include <codecvt>
+
+#include <roapi.h>
+#include <windows.ui.notifications.h>
+
+using namespace Windows::UI::Notifications;
+using namespace Windows::Data::Xml::Dom;
+
+static ToastNotifier ^ notifier = nullptr;
+
+static std::wstring
+widen(const std::string & to_widen)
+{
+	std::wstring_convert<std::codecvt_utf8_utf16<wchar_t> > converter;
+	return converter.from_bytes(to_widen);
+}
+
+extern "C"
+{
+	__declspec (dllexport) void
+	notification_backend_show (const char *title, const char *text, int timeout)
+	{
+		try
+		{
+			auto toastTemplate = ToastNotificationManager::GetTemplateContent (ToastTemplateType::ToastText02);
+			auto node_list = toastTemplate->GetElementsByTagName ("text");
+			UINT node_count = node_list->Length;
+
+			auto wtitle = widen (title);
+			node_list->GetAt (0)->AppendChild (
+				toastTemplate->CreateTextNode (Platform::StringReference (wtitle.c_str (), wtitle.size ())));
+
+			auto wtext = widen (text);
+			node_list->GetAt (1)->AppendChild (
+				toastTemplate->CreateTextNode (Platform::StringReference (wtext.c_str (), wtext.size ())));
+
+			// Mute sound, we already play our own
+			auto node = toastTemplate->SelectSingleNode ("/toast");
+			auto audio_elem = toastTemplate->CreateElement ("audio");
+			audio_elem->SetAttribute ("silent", "true");
+			static_cast<XmlElement^>(node)->AppendChild (audio_elem);
+
+			notifier->Show (ref new ToastNotification (toastTemplate));
+		}
+		catch (Platform::Exception ^ ex)
+		{
+		}
+		catch (...)
+		{
+		}
+	}
+
+	__declspec (dllexport) int
+	notification_backend_init (void)
+	{
+		if (!notifier)
+			notifier = ToastNotificationManager::CreateToastNotifier ("HexChat.Desktop.Notify");
+
+		if (FAILED (Windows::Foundation::Initialize (RO_INIT_SINGLETHREADED)))
+			return 0;
+
+		return 1;
+	}
+
+	__declspec (dllexport) 	void
+	notification_backend_deinit (void)
+	{
+		notifier = nullptr;
+		Windows::Foundation::Uninitialize ();
+	}
+
+	__declspec (dllexport) int
+	notification_backend_supported (void)
+	{
+		return 1;
+	}
+}