Update info streams correctly across multiple transforms, fixes #4877

[hansva]

• When 2 streams are attached to merge join and you open the transform automatically fill them in
• Update InfoStreams when transform names change for following transforms
  • Merge join
  • Append Streams
  • Multiway merge
  • Stream lookup
  • Join Rows

Automatically update the links when renaming a transform, splitting (dropping a transform on a hop) or using the detach this transform option

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