Replace year inputs with date-pickers in Events List view

[JJJ]

Now that sugarcalendar/standard#153 is merged, there is a need to add a more intelligent range picker to that list table. It's currently based on the Month range, which is likely not ideal when choosing to view events as a list.

We could add a select to narrow the results down to a year/month/day, or we could eliminate the range entirely and make it feel more like a regular paginated list. Going to experiment with this a bit to see what's easiest and feels best.

[pippinsplugins]

I would prefer a date picker range. It's just a lot more intuitive to use.

[JJJ]

I can pull that from EDD3. 👍

[JJJ]

PR updated to do all events for the current year. That helped to turn the boundaries into variables.

Plan to port the date range picker from EDD3 next.

[JJJ]

Still planning this for 2.0, but not ready for WIP yet.

[JJJ]

Let's improve this in 2.1.0 as well.

[JJJ]

A second year boundary was added in 2.1.2. That satisfies the original intent of this issue, but does not add date pickers per @pippinsplugins's feedback.

Going to edit this issue to reflect the next iteration of this UI.