Added new command to switch between windows

[heycalmdown]

Adds support to switch between windows.

Switch Window

shows current opened windows in the quick open dialog. Then selecting one shows the window.

It is very needed while making service with TypeScript on the Micro Service Architecture.

[msftclas]

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[msftclas]

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[coveralls]

Coverage remained the same at 60.979% when pulling 188e480 on heycalmdown:switch-window into 6dff3f6 on Microsoft:master.

[bpasero]

@heycalmdown thanks. it does not really work though when a window has no workspace associated (= empty window):

Then I think the title that we show in this picker should match 100% to the title as it is picked in the window itself. That way a user can correlate easily which window he is about to focus. Similar to how the window shows up in the "Window" menu on Mac.

Also I wonder if this functionality is not already present in the "Open Recent" picker (from the command palette):

The difference is that the "open recent" picker contains a history of all folders opened in the past, but the ones that are opened in multiple windows should be to the top.

[bpasero]

@heycalmdown let me know when I should review again

[heycalmdown]

Oh no. I just messed the history during merge upstream. 😢
What should I do @bpasero? Do you prefer to make another clean PR?

[coveralls]

Coverage increased (+0.9%) to 61.878% when pulling 6da5225 on heycalmdown:switch-window into 6dff3f6 on Microsoft:master.

[heycalmdown]

I was confused about which is the best practice making new actions, but 0653833 makes things more clearer. Thanks.

[bpasero]

@heycalmdown yes please a clean PR 👍

[heycalmdown]

@bpasero check the #11630

[bpasero]

Thanks.