Add 'New Swing in New Window' command

[lostintangent]

Fixes #97

Add a new command "New Swing in New Window" to create a new swing in a new VS Code window.

• package.json:

  • Add a new command codeswing.newSwingInNewWindow with the title "New Swing in New Window..." under contributes.commands.

• src/creation/index.ts:

  • Add a new command codeswing.newSwingInNewWindow that creates a new temporary directory for the swing and opens it in a new VS Code window.
  • Update the newSwing and newSwingFromTemplate functions to allow specifying an optional boolean parameter to open the URI in a new VS Code window.

• README.md:

  • Add the new command codeswing.newSwingInNewWindow to the list of available commands.

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