cleanup: Remove expired ports:

2022-06-30 databases/pgpool-II-36: Upstream support ended use databases/pgpool-II-43
2022-06-30 ftp/multiget: Last release in 2007, doesn't support https, depends on deprecated wxgtk28 and dead upstream. Please consider using net/uget
2022-06-30 devel/electron13: EOLed upstream, switch to newer version
2022-06-30 ftp/puf: Last release in 2006, doesn't support https and upstream is dead. Please consider using www/aria2
2022-06-30 security/gss: Abandonware, last release in 2014 and no development since
2022-06-30 security/shishi: Abandonware, last release in 2013 and no development since
2022-06-30 ftp/urlgfe
2022-06-30 www/nspluginwrapper: Abandonware, last release in 2011 and upstream is dead. NPAPI plugins are now obsolete and depends on deprecated library GTK 2
2022-06-30 devel/govendor: Use Go modules
2022-06-30 devel/racer: Racer is not actively developped now. Please consider using newer software such as devel/rust-analyzer.
2022-06-30 net-mgmt/unifi6: No longer maintained by upstream
2022-06-30 devel/dep: Use Go modules
2022-06-30 databases/libgda5-bdb: Depends on deprecated databases/db5
2022-06-30 emulators/qemu5: Use emulators/qemu6 or emulators/qemu
2022-06-30 deskutils/bitcollider: bitzi.com is no longer available, closed down in 2013
2022-06-30 converters/htx: XHTML is considered obsolete in favor of HTML5
2022-06-30 www/getleft: Abandonware last updated on 2008
2022-06-30 ftp/wxdfast: Last release in 2009, doesn't support https, depends on deprecated wxgtk28 and dead upstream. Please consider using net/uget