Allow making a binding to "state" property

Binding something to "state" property is a pretty common pattern.

For example, binding a currentText of ComboBox which has a model as a list of strings, which correspond to the name of states.

Currently in QDS, there's no way to do so in Property View, rather, users must manually edit Code eidtor to achieve it. 

If only using no-code way yields inefficient code, it may end up unnecessarily  increasing the burden of the developers who need to clean up the QML later.