Introduce MetadataTransformer entity. Add relationship from existing BundlesSource entity to MetadataTransformer entity

WIP. Introduce XmlFile entity. Add angular upload component. Rename 'template' to 'Excel template'. Rename 'Repositories' to 'Publications sources'

Will replace Options

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Replace with UserInput

Will replace WizardData

Element uses Setting now

Use auto generated DATA_CONTENT_TYPE column instead.

Use the File entity to store templates

From 1 : 1 to 1 : *, e.g. more than one condition could have the same nextStep

See doc\klassendiagramm.png for an overview

Rename destination attribute to nextStep

Rename destination attribute to nextStep

Add relation to User
Remove relation to ElementTemplate
Add PDF FileType

Add settings and formRow attributes
Remove name attribute
Remove relation to ElementTemplate