expose deleting a viewpoint in GUI

Author: aumuell

src/OpenCOVER/plugins/general/ViewPoint/ViewDesc.cpp

@@ -399,6 +399,9 @@ void ViewDesc::createButtons(const char *name,
     showAvatar_->setCallback([this](bool state)
                              { showAvatar(state); });
 
+    deleteButton_ = new ui::Action(editVPMenu_, "Delete");
+    deleteButton_->setCallback([this, master]() { master->deleteViewPoint(id_); });
+
     if (isChangeable_ && isChangeableFromCover_)
     {
         changeButton_ = new ui::Action("Change", this);

src/OpenCOVER/plugins/general/ViewPoint/ViewDesc.h

@@ -79,6 +79,7 @@ class ViewDesc: public opencover::ui::Owner
     opencover::ui::Action *button_ = nullptr; //< button in Viepoints menu
     opencover::ui::Action *changeButton_ = nullptr; //< button for change in Viepoints menu
     opencover::ui::Button *flightButton_ = nullptr; // button in flight menu
+    opencover::ui::Action *deleteButton_ = nullptr; //< button for removing viewpoint, in Viepoints menu
     bool hasScale_ = false;
     bool isViewAll_ = false;
     bool hasPosition_ = false;