[MacPorts] #53936: upgrade libical to 2.0.0

[MacPorts]

#53936: upgrade libical to 2.0.0
----------------------+---------------------
 Reporter:  pmetzger  |      Owner:
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  libical
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 Please upgrade libical to 2.0.0 -- this is a prerequisite for upgrading
 claws-mail.

 Note that the following ports require a revision bump afterwards to pick
 up the new ABI for the library:

 {{{
 comms/gnokii
 gnome/evolution-data-server
 gnome/gnome-calendar
 kde/kdepimlibs4
 }}}

 I have also obsoleted the subport "libical-devel" which was far behind the
 new revision.

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Ticket URL: <https://trac.macports.org/ticket/53936>
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