Implement online mode: now qcma can connect to the Internet to check and download update files.

Update embedded xml file.
Updated translations.

src/httpdownloader.h

@@ -0,0 +1,63 @@
+/*
+ *  QCMA: Cross-platform content manager assistant for the PS Vita
+ *
+ *  Copyright (C) 2014  Codestation
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HTTPDOWNLOADER_H
+#define HTTPDOWNLOADER_H
+
+#include <QMutex>
+#include <QNetworkReply>
+#include <QObject>
+#include <QWaitCondition>
+
+class HTTPDownloader : public QObject
+{
+    Q_OBJECT
+public:
+    explicit HTTPDownloader(const QString &url, QObject *parent = 0);
+    ~HTTPDownloader();
+    qint64 getFileSize();
+
+signals:
+    void messageSent(QString);
+
+public slots:
+    void downloadFile();
+    static int readCallback(unsigned char *data, int64_t wantlen, int64_t *gotlen);
+    void metadataChanged();
+    void readyRead();
+    void error(QNetworkReply::NetworkError);
+
+private:
+    QString remote_url;
+    QNetworkAccessManager *request;
+    QMutex lengthMutex;
+    bool firstRead;
+
+    static QMutex dataAvailable;
+    static QMutex dataRead;
+
+    static QNetworkReply *reply;
+    volatile static qint64 m_contentLength;
+
+    static char *buffer;
+    static qint64 bufferSize;
+    static qint64 downloadLeft;
+};
+
+#endif // HTTPDOWNLOADER_H