[MacPorts] #53851: Add target that bumps version and checksum

[MacPorts]

#53851: Add target that bumps version and checksum
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  Reporter:  l2dy         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by l2dy):

 Replying to [comment:7 raimue]:
 > `port -v checksum` already prints the checksums in a format suitable for
 copy&paste to the Portfile.

 Not really, there are spacing problems.

 > I am afraid that fully automating the process will lead to maintainers
 being less careful.

 And I did forget to remove revision line several times.

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Ticket URL: <https://trac.macports.org/ticket/53851#comment:8>
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