Update critiera.json by harvesting existing markdown

[koppor]

Possible development step of an ultimate comparison

• Harvest tools
• Evaluate tools
• Come up with new criteria
• Evaluate the tools

And then, the selection boxes are configured (possible values, ...)

With that approach, sometimes, not all criteria can be filtered.

Example:

It would be good if there was a script updating cirtieria.json out of comparison-elements. Thus, an existing criteria.json should not be simply overwritten, but updated.

[kleinech]

Closed with #124