Mostly plain http -> https replace, if https works. If there is a HTTP redirection, use the redirect target (unless it's a mirror or l10n like "https://kde.org/zh-cn/"). Some non-trivial change: * www.mnogosearch.org is dead. Not sure how to replace, so deleted. * use https://github.com/cacalib/libcaca for libcaca. http://caca.zoy.org/wiki/libcaca seems out-of-date. * http://www.speech.cs.cmu.edu/flite/ is dead, replaced with github repo link.
