[MacPorts] #62774: opencv: migrate remaining ports; mark obsolete and replaced_by opencv3

[MacPorts]

#62774: opencv: migrate remaining ports; mark obsolete and replaced_by opencv3
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  opencv   |
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Comment (by mascguy):

 Updated `opencv` to include comments, and user notes, clarifying that port
 is obsolete.

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Ticket URL: <https://trac.macports.org/ticket/62774#comment:3>
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