Change LOM OAI-PMH output

[utnapischtim]

The implementation of the OAI-PMH output is for the contribute tag not totally correct.

• introduce a new version of the output
• implement centry with VCARD (additions)
• add the description to the VCARD (additions)
• combine same roles into one contribute tag (change from current behavior, not backwards compatible therefore new version)

[martinobersteiner]

For documentation's sake:

LOM-UIBK states that contribute.role MUST be unique within lifecycle/metametadata (e.g. only one contribute of role "Author" is allowed within lifecycle, all authors must be within that contribute).

• invenio-records-lom.utils.LOMMetadata already assures this
• so does invenio-moodle, which uses LOMMetadata internally
• however, some of the other connector-modules don't
  

so, as of right now,

• some JSONs within the database conform with LOM-UIBK, while others don't
• some connector-modules create LOM-UIBK-conform data, while others don't
• some of the non-conforming modules store additional information in lifecycle.contribute, which is particular to that contribution (e.g. first name of that exact "Author", hence merging all contributes of role "Author" requires another way to store their particular first names)
  

to solve this,

• introduce VCARDs to store first names and such
• update non-conforming connector-modules
• migrate the database