[MacPorts] #42654: cmake: upgrade to 3.0.0

[MacPorts]

#42654: cmake: upgrade to 3.0.0
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  Reporter:  mojca@…  |      Owner:  css@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cmake    |
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Comment (by mojca@…):

 Do you mean installing both at the same time or both conflicting with each
 other?

 I don't think that there is a '''need''' to do that and I smell a lot of
 problems/complications related to side-by-side installations of `cmake2` +
 `cmake3`, but if you would like to allow it, feel free to go forward and
 try.

 It might be nice to provide a temporary port `cmake-devel` conflicting
 with `cmake`, just until `cmake` 3 gets released and then remove it. But I
 cannot imagine having both installed side-by-side in the long run.

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Ticket URL: <https://trac.macports.org/ticket/42654#comment:9>
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