Added browser launching to launch.json

[cmrigney]

This adds two options to launch.json.

launchBrowser -> URL that opens in a browser on project launch.
browserDelay -> Number of milliseconds to delay the browser opening. This can be set to "auto" to automatically launch when the http port is open. This is useful for projects that take a moment to start up.

[cmrigney]

Any updates on if this can be merged?

[weinand]

@codyrigney92 thanks for the PR. I've reviewed the PR and it looks fine, but we'd rather like to have this feature available as a preLaunchTask(or may be as a not yet existing postLaunchTask) than introducing a new but similar mechanism on a specific extension.
We are currently looking into how to support this feature as a regular task that is connected to a launch config as a preLaunchTask.

[cmrigney]

@weinand Ok thanks for the update.

[weinand]

this is now addressed by the discussion in microsoft/debug-adapter-protocol#23 and the new feature in VS Code.