WorldEvent Configuration Update

Changelog

• WorldEvents
  • element option changed to elements to allow for multiple-element events
  • text-color option added; colors text (including bossbar title, which is also bold)
  • bar-color option added; colors the bossbar itself (RED, BLUE, GREEN, YELLOW, PINK, PURPLE, WHITE)
  • event-blacklist option added; blacklisted events cannot occur when the containing event happens
  • events for the parent of a subelement will also affect the subelement
  • help command for events shows affected elements now
  • darkensky option changed to darken-sky
  • createfog option changed to create-fog
  • startmessage option changed to start-message
  • endmessage option changed to end-message
  • Added new default worldevents, Harmonic Convergence and Blood Moon