Long-distance matching beyond 2 GiB

[HT-7]

Is your feature request related to a problem? Please describe. The highest window size specifiable is --memory=2048M. , even though modern computers have more memory at their disposal.

Describe the solution you'd like I suggest allowing any window size supported by a computer.

Describe alternatives you've considered There is already lrzip, but looking at its changelog, new versions frequently break compatibilitiy with existing versions. I hope that when zst implements window size limits beyond 2048M, the first version to support it will at least be able to read from archives created in future versions.