Quests Kill Task Tweaks

This is an addon for FTB Quests, modifying the "Kill x Entity" task to fix a common issue present in many modpacks utilizing the kill task for their quests. 

Without these changes, FTB Quests grants the kill contribution only to the direct damage source that killed the entity, and shares it with their FTB Team. This poses a number of problems: 

- The damage source that killed the entity might not have the owner properly marked, especially damage methods from mods. 
- Multiple players might contribute to a kill and not be on the same FTB Team
- Players might contribute to the fight in a way that doesn't involve damaging the target (tanking, healing allies, using potions)

This results in many cases where players don't get credit for killing an entity when they feel they should have. 


This mod addresses these problems by granting the kill to teams whose members have, within 1 minute before the entity died: 
- Damaged the entity
- Had their pets damage the entity
- Taken damage from the entity
- Applied a negative effect to the entity
- Applied a positive effect to a player who damaged or took damage from the entity

- (Fabric 1.21.1+) Healed a player who damaged or took damage from the entity using a Spell Engine spell

- (Neoforge 1.21.1+) Healed a player who damaged or took damage from the entity using an Iron’s Spells ‘n Spellbooks spell

It stores this data in an optimized way and applies checks as cheaply as possible, so there should be almost no performance impact over the standard FTB Quests kill task.