Change MysqlEntity setter so that it accepts entity values for xref and mref attributes.
uml
Merge branch 'master' of https://github.com/molgenis/molgenis into feature/uml

Conflicts:
	molgenis-model-registry/src/main/resources/css/standardsregistry.css
Create separate methods for the import steps.
split off EMX metadata parser from the importer
Delegate validation to the parser.
import packages after entities
Split off the transaction callback into EmxImportWriter.
Call DDL statements on another thread in another transaction since MySql implicitly commits them as soon as they succeed.
Move the try/catch and the schema changes rollback
to the EmxImportWriter as well.
Toss away the executor thread if it is no longer in use.
share the async jdbc template to keep the total number of threads in check
uml enhancements
Merge pull request #2105 from fdlk/fix/1992

Fix #1992
Merge pull request #2106 from erwinwinder/feature/uml

Feature/uml
Merge pull request #2108 from fdlk/feature/transactImport

Feature/transact import
Fix for issue #2107
Fix safari error
Fix for issue #2094
Fix for issue #2086