World bosses

[Teclis]

Reverted epic respawn to static spawn as it was previous year. Added static spawn to Beleth - 11 days + spawn between 20-22.
Also last year's problem with Frintezza spawning always near the end of the window will be fixed, so that the chance to respawn at any time in the window is the same.

[Teclis]

Based on last year's suggestion/problem during Baium, when too much damage has been done by high level characters and even though Baium was at full HP during second try, there was no drop because the previously dealt damage was larger than the complete amount ho HP, we have implemented a reset on player's damage contribution based on which drops are calculated for Antharas and Baium. This reset will be done once Antharas or Baium go to sleep and their HP will also be restored to 100%.