[MacPorts] #62982: qt6: add port(s) for new Qt version 6

[MacPorts]

#62982: qt6: add port(s) for new Qt version 6
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 Reporter:  JDLH     |      Owner:  (none)
     Type:  request  |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  qt6 qt5 qt4
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 MacPorts has several ports qt5* and qt4*, for the version 5.x and 4.x of
 the '''Qt''' application development tool kit. The Qt upstream developers
 have released versions 6.2 and 6.1 of Qt. I would like to be able to use
 Qt version 6 for some apps which depend on it, for example '''freeciv'''.
 Thus I would appreciate a set of qt6* ports which parallel the existing
 qt5* and qt4* ports.

 Supporting information:

  * https://qt.io/
  * https://www.qt.io/product/qt6
  * https://doc-snapshots.qt.io/qt6-dev/qt-intro.html
  * https://doc-snapshots.qt.io/qt6-dev/macos-issues.html

 Given the large number of subports in `port info qt5`, I am guessing that
 making a Qt6 port might be quite a bit of work. I don't know to what
 extent it is similar enough to Qt5 that one can save effort by reusing
 parts of the Qt5 port.

 Sorry if this ticket is redundant. I don't see any "qt6" tickets when I
 search this Trac.

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Ticket URL: <https://trac.macports.org/ticket/62982>
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