"restoring shell history" feature is very invasive and dirty. I propose
removing it in the future without the replacement.
I worry it spoils the first experience of using this plugin for users
that accidentally turn it on and don't know how to turn it off, see
https://github.com/tmux-plugins/tmux-resurrect/issues/288
Also, it hurts me to reject PRs that improve the feature.
Thoughts?