New panes don't respect tab state

[jryans]

If tabs are currently toggled off and you open a new pane (View -> Panes -> Split Right or Cmd-K, Right), the new pane starts with tabs displayed.

Also, toggling only inverts the current tab state of each pane, so the two panes both toggle tab state, but never end up matching. Perhaps tab visibility should be global state that is applied to all panes.

[kankaristo]

I moved to toggle-packages, which disables tabs altogether instead of just hiding them. You lose the transition animation, but it fixes this issue.