'added process':
  from: |
    'default' -> IN read(ReadSomething)
  to: |
    'default' -> IN read(ReadSomething)
    unconnected(Frobnitzer)
  diff: "+ unconnected(Frobnitzer)"

'removed process':
  from: |
    'default' -> IN read(ReadSomething)
    unconnected(Frobnitzer)
  to: |
    'default' -> IN read(ReadSomething)
  diff: "- unconnected(Frobnitzer)"

'change component name':
  from: |
    'default' -> IN read(ReadSomething)
    unconnected(Frobnitzer)
  to: |
    'default' -> IN read(ReadSomething)
    unconnected(AntiFrobber)
  diff: "$component unconnected(AntiFrobber) was (Frobnitzer)"