Add Dev mode button

[m1ga]

Adding a button to toggle dev-mode. Instead of trying to open the devtools right away (like #80) it will just attach --debug-host localhost:8989 and you have to open the devtools yourself.

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[ewanharris]

I'm not sure about this but can understand the desire to make debugging simpler in Atom.

Would the expectation be that a developer would open devtools manually either in Chrome or in Atom? I wonder if we could also include the same translation layer we use in VS Code to allow Chrome to work with iOS.

I'm not sure however what we could do to correctly handle things like source mapping as that requires some intervention in the VS Code debugger

[m1ga]

It's a first step to #80 There it will start a devtools tab but you had to use a custom args parameter to start the debug mode. This PR adds the button. And even without #80 you could use it in a separate chrome instance. But of course the big goal is to make #80 work again