Capitalized properties used in QML that come from C++ do not error on runtime

Any property declared in QML that begins with a capital letter will error out in QML runtime. This is not the case for properties declared in C++ but used in QML.

This inconsistency is unfortunate as it can confuse the situation when developers and designers use the best practices of using mock properties declared in QML to provide a temporary backend for Qt Design Studio that are then replaced by properties that come from C++ for the real application. This can result in a developer for instance declaring a property with a capital letter and then adding this to the mocked properties in QML also with a capital letter. Unless the developer is aware to check the mocked properties in design studio she won't be aware that there is a problem.

If at all possible, the QML runtime should abort when it encounters an uppercase property declared in C++ but used in QML so that behavior is consistent and confusion does not arise.