Use pecl::intl for IDN processing

[DaSourcerer]

This is more of a note, really. In forefront of yiisoft/yii#2183, @resurtm and I discussed that it might be worth to use the pecl::intl package instead of some 3^rd party userland library. Main reason being that pecl::intl is being shipped as a default extension since PHP v5.3.

[qiangxue]

Yes, this is what I have been thinking about. We probably will drop our own number and date formatter in favor of the PECL intl package. This has the benefit that we no longer need to maintain and include the big locale data.

We will still support message translation and plural form features.

[qiangxue]

Will hear more feedback from other users before making the final decision.

[DaSourcerer]

We probably will drop our own number and date formatter in favor of the PECL intl package.

Heh, I've been too focused on IDN that I haven't even noticed this were possible. But why, yes, this makes total sense. It would even come with handy functionality such as Locale.acceptFromHttp. 👍 by me.

[qiangxue]

Closed for the reason explained in #22