[batteryarc] Add support for reading multiple batteries in one batteryarc instance #419
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For multiple batteries, each percentage gets added into "charge", and then divided by the number of batteries. Batteries with status "Unknown" don't get counted.
This way you can have a rough overall power indicator (it perhaps could be improved by reading the total capacity of each battery and mathing the actual percentage out of that, but that seems overkill).
I could make it a separate widget, or make it require a flag, if that would be preferable (this could be added to the other pull request about passing an id for which battery for the widget to read, in which case you could pass some other standard number like -1 for every battery).