added bucket options tool

src/node_tool_bucket.h

@@ -0,0 +1,16 @@
+#pragma once
+#include "node.h"
+#include "node_slider.h"
+
+class NodeToolBucket : public Node
+{
+    NodeSliderH* m_slider_threshold;
+public:
+    using this_class = NodeToolBucket;
+    using parent = Node;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_finalize(Node* dest) const override;
+    virtual void init() override;
+    void init_controls();
+    float get_threshold() const;
+};