This results in an extremely visually noticeable improvement in latency
when adding or removing sprite data and makes the game feel more
responsive.
This happens, for instance, when picking up a sprite like an apple or
flower from the environment. We check to make sure that for items
with lighting (like Velorite) or changes that otherwise affect meshing
(like changing from fluid to nonfluid) this doesn't trigger.
instead just use the same threadpool for everything
helps with debugging problems with GDB
using threadpool.install() to also be used when `into_par_iter()` is called
