Change format according to current battery level

[cunlem]

Icon fonts like provide different glyphs for different battery levels

E.g. Font Awesome has 5 levels



Currently I see no method of changing the output format based on what the current battery level is. Perhaps this could be implemented in a similar way to threshold levels?

Other module where this can be relevant for similar reasons is volume.

[vladisaev12]

pretty sure that would require rewriting every module's print function, which is different for every module.