feat/battery level labels

[jovark]

Description

I have added more labels to the battery bar component. This allows using different icons for different battery levels.

Example config

 - type: "battery"
   label_draining_low: "{battery_level}% remaining (low)"
   label_draining_medium: "{battery_level}% remaining (medium)"
   label_draining_high: "{battery_level}% remaining (high)"
   label_power_saver_low: "{battery_level}% (power saver) (low)"
   label_power_saver_medium: "{battery_level}% (power saver) (medium)"
   label_power_saver_high: "{battery_level}% (power saver) (high)"
   label_charging_low: "{battery_level}% (charging) (low)"
   label_charging_medium: "{battery_level}% (charging) (medium)"
   label_charging_high: "{battery_level}% (charging) (high)"

You can replace (low), (medium), (high) with appropriate icons.

[HolbyFPV]

Thanks for this! This is more consistent with how we do other components like network.