removal proposal: *clearsilver

[Thomas Klausner <wiz%NetBSD.org@localhost>]

Hi!

clearsilver, in pkgsrc as four packages:

www/clearsilver
www/clearsilver-base
www/py-clearsilver
www/ruby-clearsilver

is a templating toolkit. The current pkgsrc version is from 2007, the
latest version is from 2017.

Upstream development has stopped, and it seems noone was interested
enough in this to ask even for an update since 2017.

I propose removing them.

Comments?
 Thomas