filter publications not for OMTD

[pennyl67]

I see publications with values not included in the OMTD-SHARE schema, e.g.

• for publication type, values "image" and "sound"
• for licence, "closed access" or "embargo".

Two actions are required:

1. The values from OpenAIRE and CORE must be mapped to the OMTD-SHARE values (e.g. embargo --> restricted access) and only these should appear at the i/f; if there are problems in mapping them, pls ask and I'll help.
2. Some values instead of mapping must trigger blocking of the publications: for instance, "closed access" or "image" and "sound" publications should not be imported in OpenMinTeD at all.
   I think the issue is again for @kgiann78