Qt Hardware Support

### What is the problem or limitation you are having?

The Qt backend doesn't currently support the Camera or Location hardware.

### Describe the solution you'd like

These can be supported by various parts of the Qt API in a fairly straightforward way.

### Additional context

It may make sense to implement Camera and Location together, as both require using the Qt permissions system, so there will be overlap in the code.

Start by locating the Qt backend and its existing hardware or permissions integration. Read the Qt API documentation for camera and location support, then identify the tests covering backend capabilities. Done means both hardware features work through the Qt backend and permission handling is covered by tests.

Written by the indexing model from the issue text.