📝 update doc

🎨 add bgimage attribute for all elements

🎨 optimize touch event, add path bounding

🐛fixed ci, fixed size animation on layout, fixed display change clear…

… layout, fixed some sprite-extend libs to support layout

🐛 fixed layout bugs

🎨 support flexlayout, add createElement

🎉v2.3.0

📝 update doc

📝 update doc