Add "presentation mode"

Presentation mode can be entered by passing -presentationMode when
starting Qt Creator.

It displays a popup with the keyboard shortcut of the commands
that are triggered. Great for the DevDays;-)

Change-Id: I897966aab491f98e2a5abc4433c40b04e2a8db57
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>
Reviewed-by: Liang Qi <liang.qi@nokia.com>

src/plugins/coreplugin/mainwindow.cpp

@@ -252,6 +252,16 @@ void MainWindow::setOverrideColor(const QColor &color)
     m_overrideColor = color;
 }
 
+bool MainWindow::isPresentationModeEnabled()
+{
+    return m_actionManager->isPresentationModeEnabled();
+}
+
+void MainWindow::setPresentationModeEnabled(bool enabled)
+{
+    m_actionManager->setPresentationModeEnabled(enabled);
+}
+
 MainWindow::~MainWindow()
 {
     ExtensionSystem::PluginManager *pm = ExtensionSystem::PluginManager::instance();