QoL: automatic limits in attractor continuation animation

[Datseris]

Our function animate_attractors_continuation is incredible. However, it requires explicitly inputted limits as the limits do not change during the video production. It makes sense that the limits do not change, but we can improve the default limits from 0-1. We can loop over all attractors found, for all of them estimate their minimum and maximum, and use the minima and maxima of all minima and maxima as the limits.