v8.7.1 updates needed

[pryrt]

Based on v8.7.1 RC Announcement, things that look to me like it requires updated documentation:

• [x] 10. Add "Close to system tray" ability.
  • [x] Update Preferences > MISC description
  • [x] Add section to User Interface page (the minimize-to-system-tray had never had its right-click menu described) and cross-link
• [x] 11. Add tab created time tooltip for new opened untitled tab.
  • [x] User Interface page needs a mention of tab-title hover text in general
  • [x] Need to include the date in the description for new # tabs
• [x] 12. Improve GUI to avoid user confusion between Global override & Default Styles.