Makes power profiles handling available over D-Bus.
power-profiles-daemon offers to modify system behaviour based upon
user-selected power profiles. There are 3 different power profiles, a
"balanced" default mode, a "power-saver" mode, as well as a "performance"
mode. The first 2 of those are available on every system. The "performance"
mode is only available on select systems and is implemented by different
"drivers" based on the system or systems it targets.
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In addition to those 2 or 3 modes (depending on the system),
"actions" can be hooked up to change the behaviour of a particular device.
For example, this can be used to disable the fast-charging for some USB
devices when in power-saver mode.
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Note that power-profiles-daemon does not save the currently active
profile across system restarts and will always start with the "balanced"
profile selected.