[MacPorts] #55514: Add semantic versioning support to livecheck

[MacPorts]

#55514: Add semantic versioning support to livecheck
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  Reporter:  emcrisostomo  |      Owner:
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:
Resolution:                |   Keywords:  livecheck
      Port:                |
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Comment (by ryandesign):

 Generally I like the idea of making our version comparisons more accurate.
 But note that livecheck uses the `vercmp` procedure, so any changes you
 make there will affect not only livecheck but also portfiles that use
 `vercmp`, and probably even the computations of `port outdated`. This
 might change the criteria portfile authors use when deciding whether to
 increase the `epoch`. So these changes certainly need to be done with
 great care and forethought, and communication with portfile authors (i.e.
 documentation) about the changed `epoch` requirements.

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Ticket URL: <https://trac.macports.org/ticket/55514#comment:1>
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