disable default brush pressure, set 3 different quick brushes at startup

src/node_panel_quick.h

@@ -50,7 +50,7 @@ public:
 
 private:
     void init_controls();
-    NodeButtonCustom* init_button_brush(const std::string& name);
+    NodeButtonCustom* init_button_brush(const std::string& name, bool szp, bool flp);
     void handle_button_brush_click(Node* target);
     void handle_button_color_click(Node* target);
 };