encoding

Hey, can you guys add a cancel event to this? Thanks!

uppy.on('file-editor:cancel', () => {
    console.log('File Editor Cancelled')
})

Thanks!

Is your feature request related to a problem? Please describe.
When working with a big piece of text, I sometimes scroll down and copy some text into another tab. When switching back to the first tab, both the input and the output pane is back on top. So I don't know where I was working just now.

Describe the solution you'd like
After tab switching, scroll position should be remembere

This is a follow-up to v2.0 #65 to switch the default parsing on supported systems so we support BigInt strings transparently.