projectpanel/projectexplorer: added select all/deselect all functionality

app/panel/project/project.cpp

@@ -103,6 +103,16 @@ ProjectViewModel *ProjectPanel::model()
   return explorer_->model();
 }
 
+void ProjectPanel::SelectAll()
+{
+  explorer_->SelectAll();
+}
+
+void ProjectPanel::DeselectAll()
+{
+  explorer_->DeselectAll();
+}
+
 void ProjectPanel::Edit(Item* item)
 {
   explorer_->Edit(item);

app/panel/project/project.h

@@ -43,6 +43,9 @@ public:
 
   ProjectViewModel* model();
 
+  virtual void SelectAll() override;
+  virtual void DeselectAll() override;
+
 public slots:
   void Edit(Item *item);