Use display refresh rate for animations

[SaphiraKai]

This PR allows instantWM to render animations at the display's native refresh rate, instead of being locked to 60Hz.

At the moment this results in slightly bizarre code, as all the calls to animateclient() still assume 60Hz when specifying how many frames to render. This isn't necessarily a problem, it just means that when specifying how many frames to render, it's actually specifying how many frames to render assuming we're running at 60Hz, and otherwise it will be scaled to match the display.

Ideally this would be changed to something more universal, like a number of milliseconds to animate for, but it works just fine currently.

PS: don't mind the weird commit log, I forgot to make a branch for my changes when I made this fork so I've had to clean it up in order to PR lol