Convert core/edge to plasma IDS

[maarten-ic]

Fixes #44

[olivhoenen]

Working fine for me. The option for convert CLI tool (item 3 in #44) was removed or simply postponed until we get occurrence_type in DD from @imbeauf ?

[maarten-ic]

The option for convert CLI tool (item 3 in #44) was removed or simply postponed [...]

I might have just forgotten to implement that, but don't recall to be honest.
What is your preference @olivhoenen ? I could add item 3 to this PR, except for the occurrence_type, if you like?

[olivhoenen]

Yes please do add it directly there, it will help some users while testing it, and we can amend it later once the DD is updated with new identitiers