Misc Improvements

This update fixes an issue where dragging into unscheduled would change the date and time. It fixes an issue where events with no duration were not shown on the Month Schedule view. It improves the drag highlight on Horizon view when breaking out by a field, so the highlight appears over the cell being dragged over and not the whole column. It includes a new helper function “resolveCustomFields()” that will create a “proxy event” object, allowing getting and setting custom fields more easily based on the field name and not the id. There is also an under-the-hood change that will help transition to using cached access tokens. This change allows backwards compatibility with this new token format.