Replace static_casts by QOverload where possible

Mainly to get rid of the QProcess::finished deprecation warning.

Also adjust coding style in the surrounding connects when needed.

Change-Id: I12f9b248c7974b892c4a069356e578e80f8c59e9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/android/androidavdmanager.cpp

@@ -296,7 +296,7 @@ bool AndroidAvdManager::startAvdAsync(const QString &avdName) const
     auto avdProcess = new QProcess();
     avdProcess->setProcessChannelMode(QProcess::MergedChannels);
     QObject::connect(avdProcess,
-                     static_cast<void (QProcess::*)(int)>(&QProcess::finished),
+                     QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
                      avdProcess,
                      std::bind(&avdProcessFinished, std::placeholders::_1, avdProcess));