Update sinon.js to 9.0.2 to access async fake timers https://sinonjs.org/releases/v9.0.2/fake-timers/ which can then be used with acceptance tests (previously useFakeTimers didn't work with await, e.g. for visit).
Fix the bookmark acceptance test that was time based to use these new fake timers.
Add a fakeTime function that uses moment and the provided date string + timezone to freeze time using useFakeTimers and return a clock.
Add a timeStep function that accepts a clock from fakeTime and a function to run. Once the function is run we call clock.tickAsync(1000) to progress the fake clock forward 1s to progress promises/callbacks.
* Show the correct bookmark with clock icon when topic-level bookmark reminder time is set and show the time of the reminder in the title on hover.
* Add a new bookmark lib and reminder time formatting function to show time with today/tomorrow shorthand for readability. E.g. tomorrow at 8:00am instead of Apr 16 2020 at 8:00am. This only applies to today + tomorrow, future dates are still treated the same.
