This brings back the ability for the carousel to scroll in a classic
way. It turns out this is generally what we want for "seek" operations
like "random", else it's quite hard to get the expected animation.
I did experiment with applying the animation after the pooled panels are
retrieved, but in a best-case scenario there is still a gap where no
panels are displayed during the random seek operation.
In the case of automatic scroll requirements (ie. scroll to selected) we
are delegating the animation logic to the panels themselves. In order to
make this work correctly, the scroll operation needs to take effect
before any animation updates are run.
This was causing multiple issues with masking and sizing and really
didn't need to exist in the first place. Also not sure why the pool was
nested inside the scroll container, but it isn't any more. Probably for
the best.