Windows: stop storage service during write

The moment we write the block containing the partition table
Windows services will start accessing the SD card and write data
to "System volume information" folder.

If others are writing to disk concurrently this may or may not
affect our ability to eject the drive.
Stop StorSvc temporarily between us writing the partition table
(saved for last) and ejecting the SD card, just in case.

Ref #75

downloadthread.cpp

@@ -585,6 +585,14 @@ void DownloadThread::_writeComplete()
 
     emit finalizing();
 
+#ifdef Q_OS_WIN
+        // Temporarily stop storage services to prevent \[System Volume Information]\WPSettings.dat being created
+        QProcess p1;
+        QStringList args = {"stop", "StorSvc"};
+        qDebug() << "Stopping storage services";
+        p1.execute("net", args);
+#endif
+
     if (_firstBlock)
     {
         qDebug() << "Writing first block (which we skipped at first)";
@@ -610,6 +618,13 @@ void DownloadThread::_writeComplete()
 #endif
     eject_disk(_filename.constData());
 
+#ifdef Q_OS_WIN
+    QStringList args = {"start", "StorSvc"};
+    QProcess *p2 = new QProcess(this);
+    qDebug() << "Restarting storage services";
+    p2->startDetached("net", args);
+#endif
+
     emit success();
 }