holds gets entity based on first tick

[tillschallau]

Describe the bug
The holds function gets the references for entities entity1 and entity2 based on the first tick. This is problematic when an entity is not present in the first tick but appears in a later tick. In this case, the entity that appeared at a later point is not evaluated at all.

stars/stars-core/src/main/kotlin/tools/aqua/stars/core/evaluation/PredicateContext.kt

Lines 123 to 142 in 36ebc58

	fun <E1 : E, E2 : E> holds(
	predicate: BinaryPredicate<E1, E2, E, T, S, U, D>,
	tick: U,
	entityId1: Int,
	entityId2: Int
	): Boolean =
	binaryPredicateCache.getOrPut(predicate to (Triple(tick, entityId1, entityId2))) {
	val currentTick = segment.ticks[tick]
	val entity1 = currentTick?.getEntityById(entityId1)
	val entity2 = currentTick?.getEntityById(entityId2)
	entityId1 != entityId2 &&
	currentTick != null &&
	predicate.kClasses.first.isInstance(entity1) &&
	predicate.kClasses.second.isInstance(entity2) &&
	predicate.eval(
	this,
	predicate.kClasses.first.cast(entity1),
	predicate.kClasses.second.cast(entity2))
	}

Expected behavior
The entity should be acquired for the first timestamp in which the entity exists.

Additional context
Kai discovered this in his bachelor thesis.