[SunshineLuke90]

Updating the calendar widget to add additional builder customization features. Features added are below, with descriptions.

1. Define date-on-load
   This allows the builder to set the date that the calendar will load to. When this field is set, the calendar will automatically jump to that specific date. When the field is not set (blank) the calendar will instead load starting at the current date.

2. Define initial view
   The builder can now define the initial view that the calendar will load with, so it doesn't have to load to month view by default. Instead, the view can be set to load to many different views from the fullcalendar.io library, including a couple of custom "3 day" views.

3. Define optional user views
   Instead of being restricted to dayGridMonth, timeGridWeek, and timeGridDay, the builder can now choose from any set of grid, time, and list views. The user can switch between the views using the buttons in the top right of the window.

4. Set initial filter state
   The calendar comes with a filter capability, allowing the calendar view to filter the datasource, which can be used for features like "Only show features on the map within the current calendar extent" and vice-versa through map filtering actions. Previously, this would have to be user-toggled, but there is now an option in the customization to set the calendar to start filtering data as soon as it's loaded. By default, this is set to false, to maintain backwards compatibility.