PowerDevil/newTechnicalChanges

Library

We are going to move the following things into libsolid:

Additionally, we are going to make libsolid async.

Everything MUST be asynchronous
System inhibition will be delegated to systemd
Session inhibition will still be handled in the daemon
Actions will be renamed to plugins
Instead of virtuals such onProfileUnload/onIdleTimeout we will connect to signals (This will make implementation of actions simpler)
Simplify profiles by making some configurations dynamic
- Set defaults and save configuration if they are changed only
- Potentially separate Workstation, Laptop, Tablet... config values
use dbus2cpp instead of all the mess we have right now and libsoild whenever possible
Move org.freedesktop.ScreenSaver to PowerDevil
Maybe split ScreenSaver to its own repo