* [Virtual Attendants/Simulator] Implemented simulator output for ticket/message behaviors: set spam training, set status, set subject, move to.
* [CHD-3371] [Setup/Custom Fieldsets] Custom fieldsets can now be managed from the Setup->Custom Fields section.
* [Calendars/Virtual Attendants] Added Virtual Attendant macros for Calendar records.  This allows the creation of behaviors that are aware of calendar-wide automatically generated events (e.g. worklist, recurring).
* [Calendars/Snippets/Code Cleanup] Fixed a few issues with lazy loading calendar event data from snippets.
* [Virtual Attendants/Mail] Added the ability to use ticket_initial_message_* and ticket_latest_message_* placeholders in 'Before sending worker reply' behaviors.
6.4.2-checkpoint
* [CHD-3395] [Worklists/Custom Fields/Subtotals] Fixed an issue where worker-based custom fields could display two '(nobody)' subtotals depending on if the fields were NULL or zero.
* [CHD-3393] [Virtual Attendants/Worker/Availability] When setting a worker variable from a Virtual Attendant action, workers may be now be filtered by their calendar availability.
* [CHD-3389] [Mail/Worklists/Usability] Ticket worklists can now display and export the given name (first) and surname (last) of the 'first wrote' and 'last wrote' sender email addresses.
6.4.2-release checkpoint