Unsafe untitled:// usage

[bpasero]

Looking at: https://github.com/lukasz-wronski/vscode-ftp-sync/blob/14aac8903fa26e1b27b74bd1ebab30842bdaa406/modules/sync-command.js#L16

This will break in VSCode 1.25 on Windows and a better solution is to do this:

let fullPathToFile: string = <some path>;
let filePath: vscode.Uri = vscode.Uri.file(fullPathToFile).with({ scheme: "untitled:"});