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Extend LiveExtensionInspector node for score nodes

Description

Extend LiveExtensionInspector node for score nodes

Add basic custom VisualEditor support to the score extension, for
inserting a new score node and displaying live previews. (Doesn't
yet support adding attributes.)

Bug: T112925
Change-Id: I750f92e608c8b9228ee1aff8aa7b02c715c0840a