implemented a footage viewer

Essentially a minor derivation of a viewer type that can automatically view
footage from the project (i.e. not in a sequence).

app/window/mainwindow/mainwindow.cpp

@@ -54,8 +54,11 @@ MainWindow::MainWindow(QWidget *parent) :
   // Create standard panels
   node_panel_ = PanelManager::instance()->CreatePanel<NodePanel>(this);
   addDockWidget(Qt::TopDockWidgetArea, node_panel_);
+  footage_viewer_panel_ = PanelManager::instance()->CreatePanel<FootageViewerPanel>(this);
+  addDockWidget(Qt::TopDockWidgetArea, footage_viewer_panel_);
   param_panel_ = PanelManager::instance()->CreatePanel<ParamPanel>(this);
-  addDockWidget(Qt::TopDockWidgetArea, param_panel_);
+  tabifyDockWidget(footage_viewer_panel_, param_panel_);
+  footage_viewer_panel_->raise();
   viewer_panel_ = PanelManager::instance()->CreatePanel<ViewerPanel>(this);
   addDockWidget(Qt::TopDockWidgetArea, viewer_panel_);
   project_panel_ = PanelManager::instance()->CreatePanel<ProjectPanel>(this);
@@ -150,6 +153,7 @@ void MainWindow::SetDefaultLayout()
   task_man_panel_->setFloating(true);
   task_man_panel_->setVisible(false);
   curve_panel_->setFloating(true);
+  curve_panel_->setVisible(false);
 
   resizeDocks({node_panel_, param_panel_, viewer_panel_},
               {width()/3, width()/3, width()/3},

app/window/mainwindow/mainwindow.h

@@ -32,6 +32,7 @@
 #include "panel/taskmanager/taskmanager.h"
 #include "panel/timeline/timeline.h"
 #include "panel/tool/tool.h"
+#include "panel/footageviewer/footageviewer.h"
 #include "panel/viewer/viewer.h"
 #include "project/project.h"
 
@@ -60,6 +61,7 @@ private:
   NodePanel* node_panel_;
   ParamPanel* param_panel_;
   ViewerPanel* viewer_panel_;
+  FootageViewerPanel* footage_viewer_panel_;
   ProjectPanel* project_panel_;
   ToolPanel* tool_panel_;
   TimelinePanel* timeline_panel_;