[zend-config] update zend-config deps according to usage

[smhg]

@falkenhawk brings Zend_Config deps up to date, detatching Zend_Xml.

[falkenhawk]

Thanks for preparing the PR!

I need to reject it, it's very subjective but we use xml config format across all our projects. Removing zend-xml from package dependencies will make it crash after update if we don't remember to add zend-xml to project dependencies, as Zend_Config uses Zend_Xml_Security right in the constructor, so it's tightly coupled.

I hope you'll understand @smhg - could you perhaps modify the PR, leaving zend-xml where it was, and only adding zend-json to suggest, please?

[smhg]

@falkenhawk Thank you for all your work!

I totally understand if you have to be pragmatic and can't justify this change in your own projects.
In that case, I think we need to add Zend_Json, Zend_Xml and Zend_Yaml as required deps.

As a last attempt: in my project I only use Zend_Config_Ini. So I have no use for these dependencies. In my long-term attempt to get rid of ZF1 components, it sounds great to decouple them.

But again, I am fine with your decission. Shall I add the deps?