[MacPorts] #42167: demeter: update to 0.9.19; use github portgroup; remove active_variants portgroup

[MacPorts]

#42167: demeter: update to 0.9.19; use github portgroup; remove active_variants
portgroup
---------------------------+-------------------------------
  Reporter:  ryandesign@…  |      Owner:  macsforever2000@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.1
Resolution:                |   Keywords:  haspatch
      Port:  demeter       |
---------------------------+-------------------------------

Comment (by macsforever2000@…):

 I'm in contact with the developer. Version 0.9.18.2 is the latest release
 version - see also the home page. I will update the port when the 0.9.19
 branch is finished.

 Thanks for showing me those warnings. I missed that. I will look into
 adding/updating those ports.

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Ticket URL: <https://trac.macports.org/ticket/42167#comment:1>
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