Remember the last active tab and show it by default

[sindresorhus]

From the HIG:

Restore the last viewed preference pane. If the user switches preference panes, your app should remember this change and show the same pane immediately the next time the user opens your preferences window.

We don't currently do that. I think we should do it when users call .show() without an argument, and mention in the docs that that should be the preferred way to show the preferences window, and refer to the HIG docs. This would be another benefit of having #14 and we could enforce it there.

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[DivineDominion]

I always disliked this in my apps, but it's the default behavior if I remember correctly: if you call NSWindowController.showWindow, it restores the pane before closing. In fact, it seems the window stays hidden all the time during the app's lifecycle and is not disposed when closed.

So not selecting a tab when users pass nil should do the trick, i.e disable how this works:
https://github.com/sindresorhus/Preferences/blob/master/Sources/Preferences/PreferencesTabViewController.swift#L62

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