Deal with Swiftbar change

[unixorn]

Description

Swiftbar now is capturing STDERR in addition to STDOUT, which made all the logging info get spammed to the menubar.

We now default to log level CRITICAL - log output is only necessary during debugging, so this stifles all log output during normal runs by Swiftbar and Xbar.

Closes #26

Type of changes

Bugfix to cope with Swiftbar changes.

Checklist

• All new and existing tests pass.
• Any added/updated scripts added use #!/usr/bin/env interpreter instead of potentially platform-specific direct paths (#!/bin/sh and #!/bin/bash are allowed exceptions)
• Added/updated scripts are marked executable
• Scripts do not have a language file extension unless they are meant to be sourced and not run standalone. No end-user should have to know if a script was written in bash, python, ruby or whatever. Not including file extensions makes it easier to rewrite the script in another language later without having to change every reference to the previous version.
• I have confirmed that the link(s) in my PR are valid.

License Acceptance

• This repository is Apache version 2.0 licensed (some scripts may have alternate licensing inline in their code) and by making this PR, I am contributing my changes to the repository under the terms of the Apache 2 license.