DolphinQt: initial commit.

This adds the beginning of the DolphinQt user interface. It doesn't
do anything useful yet and only builds via CMake.

Source/Core/DolphinQt/Main.cpp

@@ -0,0 +1,54 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <QApplication>
+#include <QDesktopServices>
+#include <QFile>
+#include <QMessageBox>
+#include <QSysInfo>
+#include <QUrl>
+
+#include "MainWindow.h"
+
+static bool IsOsSupported()
+{
+#ifdef Q_OS_OSX
+	return QSysInfo::MacVersion >= QSysInfo::MV_10_7;
+#elif defined(Q_OS_WIN)
+	return (QSysInfo::WindowsVersion & QSysInfo::WV_NT_based) >= QSysInfo::WV_VISTA;
+#else
+	return true;
+#endif
+}
+
+static QString LowestSupportedOsVersion()
+{
+#ifdef Q_OS_OSX
+	return QStringLiteral("Mac OS X 10.7");
+#elif defined(Q_OS_WIN)
+	return QStringLiteral("Windows Vista SP2");
+#else
+	return QStringLiteral("Unknown");
+#endif
+}
+
+int main(int argc, char* argv[])
+{
+	QApplication app(argc, argv);
+	// TODO: Add command line options
+
+	if (!IsOsSupported())
+	{
+		QMessageBox::critical(nullptr, QObject::tr("Unsupported OS"),
+		                      QObject::tr("Dolphin requires %1 or greater.\n"
+		                                  "Please upgrade to %1 or greater to use Dolphin.")
+		                      .arg(LowestSupportedOsVersion()));
+		return 1;
+	}
+
+	DMainWindow w;
+	w.show();
+
+	return app.exec();
+}