(io) Allow selecting a specific implementation with SGrabberProxy
Description
Allow selecting a specific implementation with SGrabberProxy (If an application required a specific grabber without having the popup)
Functional specifications
Prevent grabber selection popup to appear and auto-select grabber if requested
Technical specifications
- Add a startTargetCamera slot with a string containing the implementation to be used by the grabber proxy
- Clear all the other implementations apart from the one selected
Test plan
Only the selected grabber should be made available afterwards