animation: migrate PHLANIMVAR from SP to UP

[PointerDilemma]

Requires https://github.com/hyprwm/hyprutils/pull/93

Describe your PR, what does it fix/add?

Described in the hyprutils PR.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

Testing is welcome. Hope I didn't forget a call to lock somewhere.

Is it ready for merging, or does it need work?

Not ready, requires the hyprutils PR.