Thank you for the PR. I am merging it in a new feature branch for now because I plan to add a configurable separation line between the filled and unfilled part of the bar (such as in "proportional overflow mode") to be able to style xob like default bars such as in the mpv video player (fully transparent unfilled section with black outlines to make it visible on bright backgrounds). We also need to document these new features. Also there might be discussion as to how to name the fields and handle missing colors in the configuration file to avoid breaking people's config too much while still showcasing the feature.