Calendar meeting updates now send necessary emails without adding extra chatter messages that tell users an email was sent. This reduces noise in records while keeping attendees informed and clarifies meeting-related labels and notification descriptions.

- remove 'an email has been sent' chatter message; just send the email
  but do not spam people about it;
- tracking does not trigger specific subtype, just log the tracking;
- invitation subtype had a description not matching its use;
- renamed the calendar.event description from event to meeting

This update improves how customer ratings are collected, displayed, and reported across projects, tasks, and issues. Teams gain clearer feedback views, automated rating emails, and dashboard metrics that make customer satisfaction easier to track and act on.