Divine Guile Marker M+

v1.1.0: Mark boss immediately via boss frames; add target/focus/party fallbacks

• Remove dependence on nameplate counting for Divine Guile detection;
  nameplates are unreliable for this encounter
• Mark the real boss as soon as encounter is detected via boss1-5 frames
• Encounter detection now falls back to target, focus, and party1-4target
  if boss frames aren't populated
• FindUnitByGUID also checks party member targets when locating unit to mark
• Use C_NamePlate.GetNamePlates() in FindUnitByGUID for nameplate scanning