Document the limitations when Component is referenced from unsupported context and what are the supported use cases

Attached example fails to compile and it prints the following error message:
"Properties of type "Component" are not supported"

The example code is working in normal Qt Quick when tested so this appears to be a limitation specific in Qt for MCUs. Unfortunately this limitation is not mentioned in the documentation of the Qt for MCUs.

Such error is printed by qml2cpp when Component is referenced from unsupported context. Referencing Components is supported only from Qul::Property<Component *>
property bindings in Qt for MCUs.

As a suggestion, mentioning the above limitation and what is supported should be mentioned in the documentation.