[REFACTOR] Make Renderer available to qml #156
Description
Refactor Request
The workflow through MainWindowHandler and Mainlogic is unnecessarily complicated. The workflow classes should be directly available to qml.
Description of the proposed solution
Use RegisterType or QML_Element for Renderer class and add it directly to the qml files.
Other solutions could be the usage of a property or a qml element wrapper class.
Additional context
It should be done after #155.