Improve error message when failing to locate images #101
Description
Short overview
As a nut.js user I want to get additional information why image detection failed.
Use case
Easier debugging of failures
Detailed description
Currently, nut.js only reports a failure to detect images with an error message similar to the following:
Failed: Searching for $image failed. Reason: 'Unable to locate $image, no match!'
It would be nice to have more detailed output why detection failed, e.g. confidence values etc.
Additional content
Please provide any (mandatory) additional data for your enhancement