Extract canvas object draw and brush panel services

src/legacy_brush_panel_services.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <string>
+
+class NodePanelBrush;
+
+namespace pp::panopainter {
+
+class LegacyBrushPanelServices final {
+public:
+    explicit LegacyBrushPanelServices(NodePanelBrush& panel) noexcept;
+
+    int find_brush(const std::string& name) const;
+    std::string get_texture_path(int index) const;
+    std::string get_thumb_path(int index) const;
+    bool save();
+    bool restore();
+    void clear();
+    void scan();
+    void reload();
+
+private:
+    NodePanelBrush& panel_;
+};
+
+} // namespace pp::panopainter