feat: Absolute animation time

[m0ppers]

The Animator currently expect a delta time. I find this a bit awkward to use (obviously opinionated). In my application I want to have a slider to control the animation and my suggestion would be to have an absolute animation time instead of the progress() function.

Just a suggestion. For now I will just implement my own animator (which is simple enough to implement)

[schell]

Oh yeah, this should definitely exist. I'll have to add two ways to set the timing.