battery: Add status_bat_{low,quarter,half,three_quarters} #512
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This allows for splitting status_bat by quartile, coinciding with
the FontAwesome battery icons, adding three additional thresholds to
accomodate it.
status_bat_* will only be effective if they're not set to the default
value ("BAT") in which case status_bat is used as expected, providing
backward compatibility with existing configurations.