disable virtualWorkspaces with reason why

[nrayburn-tech]

Virtual workspaces cannot be used because editorconfig requires file system access through node's fs. There was also 1 or 2 other places in the code that were questionable as to whether they could be converted to support virtual workspaces or not.

fixes #306

• Use a meaningful title for the pull request.
• Use meaningful commit messages.
• Run tsc w/o errors (same as npm run compile).
• Run npm run lint w/o errors.