Diagram Editor: API to specify SNode for element in generic edge/box query

[till-f]

Via an additional query in the diagram language it should be possible to specify the corresponding SNode for an element of the “generic edge query” and “generic nodes query” (likewise already existing query for “diagram ID”). Reason: it must be possible to display multiple graphical elements for the same node / it must be possible to display the same node multiple times. Example: “Logical Connection” in Security Analyst.