[MacPorts] #48226: QMK-Groundstation: use qmake PortGroup, require qwt52

[MacPorts]

#48226: QMK-Groundstation: use qmake PortGroup, require qwt52
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 Reporter:  michaelld@…  |      Owner:  macports@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.3
 Keywords:  haspatch     |       Port:  QMK-Groundstation
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 subject says it all. patch attached. minor changes, but want to run them
 by the owner first.

 fix master site to match their new website repo.

 moving to the qmake PortGroup is pretty simple; this addresses ticket
 #39424.

 I want to deprecate qwt 5.1.2 and move the 'qwt' port to the latest 5.2
 series, to match up with how the QWT project is handling their repos
 (latest 5 and latest 6). If this port is compatible with qwt6+, then I'd
 recommend adding in a variant to handle selection (I didn't test this, one
 way or the other).

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Ticket URL: <https://trac.macports.org/ticket/48226>
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