Rename battery plugin to battery-bme
Add upower based battery plugin

Tracks battery level and charging status via UPower D-Bus API.

[mce] Add upower based battery plugin
Remove unused debug code
Use upower battery plugin by default

MCE loads battery-upower plugin, not battery-bme by default.

[mce] Use upower battery plugin by default
Ignore activate/deactivate requests for LED patterns handled by MCE

This should be reverted once lipstick stops making requests for
activating/deactivating charging patterns.
Merge pull request #81 from spiiroin/battery_upower

Implement and use UPower Battery plugin