integrate quick brushes, simulate pressed keys on windows active

src/node_panel_quick.h

@@ -4,6 +4,7 @@
 #include "node_border.h"
 #include "node_dialog_picker.h"
 #include "brush.h"
+#include "node_stroke_preview.h"
 
 class NodePanelQuick : public NodeBorder
 {
@@ -25,6 +26,7 @@ public:
     NodeButtonCustom* m_button_brush2;
     NodeButtonCustom* m_button_brush3;
     NodeButtonCustom* m_button_brush_current;
+    NodeStrokePreview* m_button_brush_current_preview;
     std::shared_ptr<NodeColorPicker> m_picker;
     virtual Node* clone_instantiate() const override;
     virtual void clone_finalize(Node* dest) const override;