Guinaifen Talent and E4 listener bugs

[kdovtdc]

As of right now, whenever a new enemy would be added, neither Talent nor E4 listener would be added to the enemy (even for the very first "wave" of enemies since they are created after the first CharactersAdded emit).

srsim/internal/character/guinaifen/talent.go

Lines 50 to 69 in d892c70

	for _, trg := range c.engine.Enemies() {
	c.engine.Events().CharactersAdded.Subscribe(func(e event.CharactersAdded) {
	c.engine.AddModifier(trg, info.Modifier{
	Name: FirekissListener,
	Source: c.id,
	})
	})
	}
	// apply E4 listener to all enemies at the start
	if c.info.Eidolon >= 4 {
	for _, trg := range c.engine.Enemies() {
	c.engine.Events().CharactersAdded.Subscribe(func(e event.CharactersAdded) {
	c.engine.AddModifier(trg, info.Modifier{
	Name: E4Listener,
	Source: c.id,
	})
	})
	}
	}

[kdovtdc]

additional concerns:

• subscriptions should only be done once,
• stacking type of FirekissListener should be ReplaceBySource,
• missing logic to remove when character dies