Support ctrl-w ctrl-w to cycle focus between open windows/editors

[drmohundro]

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What did you do?

ctrl-w ctrl-w

What did you expect to happen?

Cycle focus to the next active editor (pane).

Current vim help docs describe this as:

CTRL-W CTRL-W - move cursor to window below/right of the
current one. If there is no window below or right, go to
top-left window.

What happened instead?

Nothing

Technical details:

• VSCode Version: 0.4.2
• VsCodeVim Version: [please ensure you are on the latest]
• OS: Windows 10, macOS Sierra