Add fallback code for old mason ui for workflow probing
New generic validators Connector and Regex
Add validators for metadata workflow
Remove email formater (not implemented yet)
Merge remote-tracking branch 'dsiebeck/feature/webui' into feature/webui
Merge remote-tracking branch 'dsiebeck/feature/webui' into feature/webui
Merge remote-tracking branch 'dsiebeck/feature/webui' 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)
Change back server url
Redirect the browser on workflow creation to have a nice url
Add magic for handling multivalued workflow fields
Merge branch 'develop' into feature/webui
Merge branch 'develop' into feature/webui
Merge remote-tracking branch 'dsiebeck/feature/webui' into feature/webui
Adjust clonable fields hash for api change
Merge remote-tracking branch 'origin/feature/webui' into feature/webui