Without this change, when the `Judged` value is checked on an
`HitObjectLifetimeEntry` it would return `true` if a `DrawableHitObject`
has not yet been associated with the entry. Which is completely wrong.
Of note, the usage in `DrawableHitObject` will have never fallen through
to this incorrect value as they always have a result populated:
f26f001e1d/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs (L721-L726)
Previously, some judgement results were not reverted
when the source DHO is not alive (e.g. frames skipped in editor).
Now, all results are reverted in the exact reverse order.
Override SetLifetimeStart/SetLifetimeEnd separately to track individual assignment. It is necessary to ensure real lifetime is not lost when lifetime is partially updated.
Hidden properties are used when the type is the base class. It caused issues when `DrawableHitObject` logic is factored out to `PoolableDrawableWithLifetime` because it is using the base `LifetimeEntry`, not `HitObjectLifetimeEntry`.
