Say hello to QConfigurationBackend

Base class for all configuration backends.
Change of design

Move the burden of schemas from run-time to compile-time.
A CLI tool that creates C++ and QML code to access settings will be
implemented in the future.

Meanwhile we borrow the design from Qt.labs.settings and make it work
on C++ without the need to create a component.
Example of reading and writing QObjects
DConf backend
Ignore configure results
Save target object

Store the target QObject.