Add fallback code for old mason ui for workflow probing
New generic validators Connector and Regex
Add validators for metadata workflow
Fix inline docs
Merge branch 'develop' into feature/webui
Add some more magic glue for multivalue fields in metadata

Fiels in the metadata workflow can now be marked multivalued
which lets the new ui render cloneable fields. The class can also
transition from scalar values to multivalues when loading the
initial metadata fro the table as the issuance wfl usually only write
a single item (e.g. mail)
Version Bump 0.11.4-3
Merge branch 'develop' into feature/webui