* packages/packages.current: Update Curl to 7.30.0.
* src/inst-claws-mail.nsi: Install internal plugins rssyl, spamreport
and vcalendar.
* src/uninst-claws-mail.nsi: Uninstall them.
* src/inst-sections.nsi: Remove old external plugins.
* src/inst-rssyl.nsi, src/inst-vcalendar.nsi, src/uninst-rssyl.nsi
* src/uninst-vcalendar.nsi: Remove.