Refactor svgtoqml tool

The generator of the tool currently does two things, it writes a qml syntax to a stream which will be saved to a file, and create a QtQuickItem. Additionally, the generator lives in the svgtoqml directory which make it unusable by any other module.

The goal is to move the generator part to a separate module and refactor it into two different generators, one that generates a QML file and the other one generates QtQuickItem. This will make it more usable and easy to add the missing features in the future.