Allow to set breakpoints in crawler definitions

Summary

#187

This idea is very simple:

As soon as a Converter matches, activate the pydb if "breakpoint: true" is part of its definition.

This allows to interactively step through the scanning process at the point where a scanner matches.

Test Environment

Use a cfood of your choice, add "breakpoint: true" somewhere and run the scanner/crawler.

Validate with "breakpoint: false" that it is not run in this case.

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