Use Qt provided forward declaration header

src/app/filelogger.cpp

@@ -33,6 +33,7 @@
 #include <QDateTime>
 #include <QDir>
 #include <QTextStream>
+#include <QVector>
 
 #include "base/global.h"
 #include "base/logger.h"

src/app/upgrade.cpp

@@ -29,6 +29,7 @@
 #include "upgrade.h"
 
 #include <QFile>
+#include <QVector>
 
 #include "base/logger.h"
 #include "base/profile.h"