refactored handling of nodes and node figures to solve #151#152

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sailingKieler wants to merge 1 commit intomasterfrom cs-issue151

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Commits on Jan 9, 2023

klighd, klighd.piccolo & friends: added 'FOREGROUND_NODE' & 'BACKGROUND_FIGURE' to 'KlighdProperties', refactored handling of nodes and node figures to solve #151
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