animation: fix crashes and cleanup of active vars

[PaideiaDilemma]

Thanks a lot to @gulafaran and @vaxerski for debugging and finding the crash.
The first commit here adds a test for it.

The rest of the patch is an alternative to resetting the pAnimationManager pointer with a signal, when it gets deleted.

Instead i thought it would be better to just use signals for connect/disconnect in the first place. That removes the need for storing the pointer to pAnimationManager. (We still need it for getCurveValue, but in a next abi breaking change, we could remove it. For now it is guarded by the reference to the events)

And then there seems to be a problem with a growing active vars vector.
I think it happens in Hyprland when we are not ticking and thus not cleaning up active vars. So this adds a lazyDisconnect method that just increments an integer. If we want to add a new var and this integer is > 100, we manually trigger a cleanup.

I also have no problem in reverting the removal of vars to how it worked before moving the anim stuf to hyprutils. (always using forceDisconnect and making sure we are not calling it during tick.) That would be the alternative to the lazyDisconnect thing.

Should not break ABI. Breaks ABI

[vaxerski]

this does break ABI in like 20 places, but I believe the "> 100" solution kinda sucks. I'd just always schedule a cleanup after a warp

[PaideiaDilemma]

Patch for hyprland: patch.txt

[vaxerski]

can we not break API at least?

[gulafaran]

tested here, seems to work as intended. as a bonus seems to have fixed some micro stuttering ive had on certain animations after a while, probably because the leak has been building up for a while.

[vaxerski]

I'll just fix this up myself, give me a momento

[vaxerski]

@gulafaran check now, it doesn't break API (so hyprland doesnt need any patches)

[PaideiaDilemma]

Thanks for cleaning it up. Looks good.

Just keep in mind that if we don't set warp(true, false) during tick in hyprland, it will clean up the variable during the tick potentially leading to weirdness (should be ok but I would add it for the release.)