expo image editor 5 crop reference

reference:
http://chuanshuoge2.blogspot.com/2020/02/expo-image-editor-4-rotate-flip.html

multi slider
https://github.com/ptomasroos/react-native-multi-slider
https://medium.com/@KPS250/custom-scale-slider-in-react-native-cb3e6ff786bd
https://github.com/KPS250/React-Native-Scale-Slider

image position
https://stackoverflow.com/questions/30096038/react-native-getting-the-position-of-an-element

dynamic ref
https://medium.com/@jalexmayer/react-refs-with-dynamic-names-d2262ab0a0b0