Swap order of `ctrl-w` and `ctrl-f4`

This allows `Ctrl-W` to appear in the system menu again until
the atom-shell issue with function keys is fixed.

Refs electron/electron#485
Closes atom#3283

Use opacity to blink cursor instead of visibility so blink can be styled

Merge pull request atom#3248 from atom/atom-shell-0.15.6

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Merge pull request atom#2919 from atom/bo-the-wiggle

Fix width too wide when softwrap enabled when editor can vertical scroll

Be more defensive in ReactEditorView::activate

It is conceivable that a package could have a reference to a view
that is not within a pane. 

Fixes atom#2853

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