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.
Every file has now been manually vetted by me. Due to the extent of
the changes, I've been unable to test all scenarios to make sure this
all works. :(
Also get rid of the "up" arrow so as not to indiciate direction. This is important because in future the RM will not be based on what has been paginated into the client (but instead RM will be handled server-side) and thus we cannot assert any kind of direction on it relative to the events in the viewport.
