In ORT's license-classifications.yml, prefix categories with their origin

[sschuberth]

Currently, entries look like

LDBcollector/ort/license-classifications.yml

Lines 51 to 57 in 4f5f327

	- categories:
	- permissive
	- maybe-rating:Stop
	- maybe-rating:No-Go
	- osi-approved
	- fsf-free
	id: AAL

As LDBcollector aggregates origins of classifications, it's unclear where e.g. "maybe-rating:Stop" comes from. Could we extend the "colon-syntax" to add another <origin>: prefix to the categorization?

For "common" categorizations like "permissive" that approach would be the additional advantage to see which origins all agree on the "permissive" categorization.