Feature: Support ctrl-w q in normal mode to quit window

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What did you do?

In normal mode, press ctrl-w q

What did you expect to happen?

I expected the window to close (see http://vimdoc.sourceforge.net/htmldoc/windows.html#CTRL-W_q).

What happened instead?

Nothing.

Technical details:

• VSCode Version: 1.9.1
• VsCodeVim Version: 0.5.3
• OS: Ubuntu 16.04