select
Opens the platform's image picker and returns the selected ImageData, or null if the user cancels the selection. The image isn't loaded in the memory in its actual size, it's downsampled according to the current window size of the app and then loaded into memory as ImageData which is lower than the actual size eliminating the possibility of OutOfMemoryError
Parameters
loading
a callback to pass true if image is processing and false if it has finished processing the image.