Fix some deprecation warnings in basic plugins

Fix warnings apppearing in 5.13, for example:
warning: ‘QDir& QDir::operator=(const QString&)’ is deprecated: Use QDir::setPath() instead [-Wdeprecated-declarations]
...
warning: ‘static QRgb QColorDialog::getRgba(QRgb, bool*, QWidget*)’ is deprecated: Use getColor() [-Wdeprecated-declarations]
warning: ‘Qt::DropAction QDrag::start(Qt::DropActions)’ is deprecated: Use QDrag::exec() instead [-Wdeprecated-declarations]
warning: ‘void QProcess::finished(int)’ is deprecated: Use QProcess::finished(int, QProcess::ExitStatus) instead [-Wdeprecated-declarations]
...
warning: ‘const QRect QDesktopWidget::availableGeometry(int) const’ is deprecated: Use QGuiApplication::screens() [-Wdeprecated-declarations]
...
warning: ‘const QBrush& QPalette::background() const’ is deprecated: Use QPalette::window() instead [-Wdeprecated-declarations]
...
warning: ‘const QBrush& QPalette::foreground() const’ is deprecated: Use QPalette::windowText() instead [-Wdeprecated-declarations]
...
warning: ‘void QTextOption::setTabStop(qreal)’ is deprecated [-Wdeprecated-declarations]
warning: ‘void QList<T>::swap(int, int) [with T = ProjectExplorer::BuildStep*]’ is deprecated: Use QList<T>::swapItemsAt() [-Wdeprecated-declarations]
warning: ‘void QProcess::setReadChannelMode(QProcess::ProcessChannelMode)’ is deprecated: Use QProcess::setProcessChannelMode() instead [-Wdeprecated-declarations]
...
warning: ‘QString QFileInfo::readLink() const’ is deprecated: Use QFileInfo::symLinkTarget() instead [-Wdeprecated-declarations]

Change-Id: I1d893d42d372245892f2de8406f52dbe7bbd552a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/fileutils.cpp

@@ -82,7 +82,7 @@ bool FileUtils::removeRecursively(const FileName &filePath, QString *error)
     QFile::setPermissions(filePath.toString(), fileInfo.permissions() | QFile::WriteUser);
     if (fileInfo.isDir()) {
         QDir dir(filePath.toString());
-        dir = dir.canonicalPath();
+        dir.setPath(dir.canonicalPath());
         if (dir.isRoot()) {
             if (error) {
                 *error = QCoreApplication::translate("Utils::FileUtils",