Should restore window options, too

[jwm]

Hi, thanks for writing tmux-resurrect!

I've been using it for a while now, and noticed that it doesn't save window options. In my case, I noticed that activity monitoring (setw monitor-activity) isn't saved or restored.

It looks like it would be straightforward to add, by having save.sh:dump_windows() run tmux show-window-options -g to save global window options, then tmux show-window-options -t${window_number} for each window. restore.sh:restore_pane_layout_for_each_window() would then restore the options.

I'd be happy to work on this if you like the design and would accept the PR.