[MacPorts] #44056: grass: upgrade to 7.0.0

[MacPorts]

#44056: grass: upgrade to 7.0.0
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  grass    |
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Comment (by mojca@…):

 I committed the necessary change to my user tree (linked above). We
 probably need more variants for mysql and maybe less for postgresql. I'm
 not sure to what extent Grass 7.0.0beta3 works better with wxWidgets 3.0,
 but I would prefer to drop support for 2.8 if possible as that only
 confuses matters and wxWidgets is at least supposed to be supported
 upstream.

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Ticket URL: <https://trac.macports.org/ticket/44056#comment:5>
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