This replaces most of the GIF spinners used throughout the app with an
SVG that respects the user's theme. However, spinner.gif is still
retained for the room timeline avatar uploader component, since it is
more difficult to replace.
Signed-off-by: Robin Townsend <robin@robin.town>
We use `export default` begrudgingly here. Ideally we'd use just `export`, though this entire SDK expects things to be exported as a default. Instead of breaking everything, we'll sacrifice our export pattern for a smaller diff - a later commit can always do the default export -> regular export conversion.
This allows Webpack to insert the proper image URL after builds steps like
adding a hash and so on. The path you supply to `require` is relative to the JS
source file, just like any other would be.
