RESEARCH: Better error reporting for sensors API

Overview

There's quite a few cases where we have methods that can fail but that do not return a status code. Since we probably can't resort to exceptions, this needs to be reviewed.

I think part of the problem was the "design for QML" mentality that went into the original design. A slot does not normally return anything.

The existing error reporting mechanism seems practically useless so it should probably just be scrapped.

Acceptance Criteria

• A solid understanding of how error reporting will work for both C++ clients and QML clients
• User stories for the implementation