Tracking affiliation in campaigns and deliverables

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Both Campaigns and their Deliverables can have official support by the HTC and/or CHT, but it is also possible that they cover Humane Tech awareness activities that are not fully supported.

To distinguish between officially supported or not, both Campaigns and Deliverables will have a Affiliation field, that can be either Official, or Unofficial.

• [x] Update information model with Affiliation field
• [x] Update existing proposals
• [x] Update issue templates

[aschrijver]

All tasks done. Closing.