Start work on launching a stream from QML and rip out remaining QtWidgets

app/gui/appmodel.h

@@ -2,6 +2,7 @@
 
 #include "backend/boxartmanager.h"
 #include "backend/computermanager.h"
+#include "streaming/session.hpp"
 
 #include <QAbstractListModel>
 
@@ -22,6 +23,8 @@ public:
     // Must be called before any QAbstractListModel functions
     Q_INVOKABLE void initialize(ComputerManager* computerManager, int computerIndex);
 
+    Q_INVOKABLE Session* createSessionForApp(int appIndex);
+
     QVariant data(const QModelIndex &index, int role) const override;
 
     int rowCount(const QModelIndex &parent) const override;