* Remove IE polyfills and special casing
* dashboard: remove `resize-observer-polyfill`
* deps: remove url-parse to use global `URL` instead
* Update documentation for browser support
* Add a migration guide
* Update e2e test platforms
* Remove polyfills from examples and add those missing in CDN bundle
* Use Node.js v16.x on CI because of `AbortController`
* Update bundle builder to produce two builds: `uppy.js` without polyfills, `uppy.legacy.js` with polyfills.
* Upgrade create-react-app deps
* remove null coalescing operator as it's not supported by the build chain
* disable Safari testing (for now)
Co-authored-by: Renée Kooi <renee@kooi.me>
* /examples/dev - added polyfills for easy development in IE11
* @uppy/dashboard - made all svgs not focusable in IE11
* /examples/dev - started sharing serviceWorker registration code
* /examples/dev - added polyfills for IE11 to dev bundle
* /examples/dev - added drag-drop plugin dev environment
* @uppy/drag-drop - moved isDragDropSupported() to @uppy/utils
* @uppy/drag-drop - got rid of drag-drop npm library
* examples/dev - made compiled files placed in /output instead of /lib
* ~/examples/dev - made watchify only watch files once
* @uppy/drag-drop - add onPaste
* /examples/dev - readded html css override-attempts
* @uppy/drag-drop - made whole area clickable, and made it accessible
* @uppy/drag-drop - removed excessive outline in firefox
* REVERTED last 2 commits