Add non-functional default embedded_relations_fields config option
build result for getEmbeddedRelationsFieldsConfiguration

result is of the form
array(
'EmbeddedRelation1' => $params,
...
)
Apply embedded_relations_fields in configureFields
move precomputation to the top op the file
Create configureFieldsEmbedded* function for each embedded relation
Replace generated code in configureFields with function call
apply generated configureFieldsEmbedded* function for n:m relations
Merge branch 'embeddedRelationsFields'