Allow configuration from .vscode/settings.json when in a Multi-root project.

[WraithKenny]

No description provided.

[WraithKenny]

The conflict is only the version number

[WraithKenny]

Sorry for the white space in the diff, my code editor automatically does that.

[soderlind]

Thank you :)

[soderlind]

Found one error, if ${workspaceRoot} is used, this will fail:

        if (this.executablePath.startsWith("${workspaceRoot}") || this.executablePath.startsWith("${workspaceFolder}")) {
            this.addRootPath("${workspaceFolder}");
        }

.. I've fixed it

[WraithKenny]

I don't think the code would've failed. workspaceRoot is deprecated (but still functional) and should generally be replaced with workspaceFolder.

I see how it might be desirable to support it as it was previously, as workspaceRoot will resolve to the first folder (workspaceFolders[0]) instead of the current folder, if anyone wants to rely on that (its a bit hacky behavior). Maybe leave it as an undocumented feature :-)