Since users will most likely be working with a divider most of the time,
there's no reason to waste memory space with undivided frames considering
the dividing process is quite fast.
- Replaces QLinkedList with std::list as recommended by Qt docs.
- Replaces QWheelEvent::delta() with QWheelEvent::angleDelta(). This
should also benefit trackpad behavior.
A pool can allocate/destroy any amount of arenas during runtime, meaning it
won't run out of memory but we still get the advantages of one large allocation
as opposed to hundreds of small allocations.
itsmattkc