feat(editor): array of the selected model in the toolset, after the array modifier of Blender: fixed count or fit length, relative and constant offset along the axes of the model, turn per copy, copies following the ground; the array follows its settings until something else is selected or changed, and is a single step of the undo history

application/editoruilayer.cpp

@@ -103,6 +103,11 @@ void editor_ui::render_header_sections()
 		m_itempropertiespanel.render_body();
 		ImGui::Unindent();
 	}
+	if (ImGui::CollapsingHeader("Array"))
+	{
+		if (m_arrayoptions)
+			m_arrayoptions();
+	}
 }
 
 void editor_ui::render_menu_contents()