Wrote new controller for detecting write permissions

- Determines if we can write to the config and module directories.
Enable fs-permissions as RPC service
Raise modal when FS is not writable

- Raises a dialog when the filesystem permissions are not writable.
- Updated controller to report the ENV user the server is running under, so that
  we can report that in the modal dialog.
Rebuilt distribution
Merge branch 'feature/detect-fs-permissions'

New feature: detect FS permissions on initial load of admin, and display a modal
dialog if we cannot write to the filesystem.