add ABR brushes and presets with properties and patterns

src/node_panel_brush.h

@@ -44,6 +44,7 @@ class NodePanelBrush : public Node
         int m_high_len = 0;
         int m_thumb_len = 0;
         bool m_deleted = false;
+        bool m_user_brush = false;
     };
 public:
     std::function<void(Node* target, int index)> on_brush_changed;
@@ -131,5 +132,6 @@ public:
     void handle_click(Node* target);
     bool save();
     bool restore();
+    void add_brush(std::shared_ptr<Brush> brush);
 };