Add command line parameters. Fixes #30 (#89)

* Add command line parameters. Fixes #30

* Fixed compile errors

* Fixed code review findings

* Fixed code review findings, take 2

app/cli/startstream.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <QObject>
+
+class ComputerManager;
+class NvComputer;
+class Session;
+class StreamingPreferences;
+
+namespace CliStartStream
+{
+
+class Event;
+class LauncherPrivate;
+
+class Launcher : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE_D(m_DPtr, Launcher)
+
+public:
+    explicit Launcher(QString computer, QString app,
+                      StreamingPreferences* preferences,
+                      QObject *parent = nullptr);
+    ~Launcher();
+    Q_INVOKABLE void execute(ComputerManager *manager);
+
+signals:
+    void searchingComputer();
+    void searchingApp();
+    void sessionCreated(QString appName, Session *session);
+    void failed(QString text);
+
+private slots:
+    void onComputerUpdated(NvComputer *computer);
+    void onTimeout();
+
+private:
+    QScopedPointer<LauncherPrivate> m_DPtr;
+};
+
+}