Property overrides not properly supported

In the Figma bridge we have a special case for text, that does not support chaining/nesting overrides.

Generally overrides are not fully supported.

Issues:

• Overrides that come from floating point issues, like 320.00001.
• Dealing with defaults lie visible. We ignore visible true because this is the default (noisy QML), but what do we do if this is an override and the default was changed to false. This case is hard to detect.