added color picking with ALT key, added crash report library for windows

engine/node_canvas.cpp

@@ -156,6 +156,7 @@ void NodeCanvas::handle_resize(glm::vec2 old_size, glm::vec2 new_size)
 
 kEventResult NodeCanvas::handle_event(Event* e)
 {
+    static std::vector<CanvasMode>* old_mode = nullptr;
     Node::handle_event(e);
     MouseEvent* me = static_cast<MouseEvent*>(e);
     KeyEvent* ke = static_cast<KeyEvent*>(e);
@@ -186,6 +187,7 @@ kEventResult NodeCanvas::handle_event(Event* e)
         if (ke->m_key == kKey::AndroidBack)
             if (!ActionManager::empty())
                 ActionManager::undo();
+
         break;
     case kEventType::KeyUp:
         //             if (ke->m_key == kKey::KeyE)