[RFC] Deprecate PEAR/PECL & Replace with composer/pickle

Hi internals, I'd like to introduce a new RFC to deprecate pear/pecl (in 7.2, and remove in 8.0), as well as add composer/pickle (optional in 7.2, default in 7.3+) in their place. https://wiki.php.net/rfc/deprecate-pear-include-composer I highly recommend reading the twitter poll and accompanying thread at https://twitter.com/dshafik/status/756337267547832320 I believe that pickle solves the issues with regards to pecl, and have run the idea passed Jordi and Pierre. Both are fine with this RFC. :) I understand that adding in composer/pickle is just setting us up for having a future "Deprecate composer/pickle & Replace with foo/bar" RFC, so I've proposed the voting reflect that some people will just want to deprecate/remove pear/pecl and not replace them at all. I'm also proposing voting choices around the optional/default introduction of composer/pickle. - Davey