[phpCallGraph-general] Updated version of phpCallGraph

Hello,

I was interested in obtaining the call graph for one of my software, and 
found phpCallGraph. I got issues running it with PHP 5.6/7.0, so I fixed 
the major bugs I encountered.

The resulting patched phpCallGraph is on my GitHub account [1], with the 
last versions of ezcomponents, CodeAnalyzer, and PEAR librairies. When 
running it, the major issues I still have are related to autoloading 
classes.

I successfully ran it on:
* src/PHPCallgraph.php
* my MediaWiki extension [2]
* some other MediaWiki extensions or packages [3]

I plan to improve the quality of phpCallGraph, apart if there is another 
more recent call graph creator for PHP I’m not aware of:
* fixing major bugs: autoloading (e.g. Composer autoloader), missing 
indices in arrays
* in the longer term, improve the inner quality:
   * I was surprised because ezReflection does not add a lot of features 
compared to the standard (today’s) Reflection and it is responsible of 
quite a lot of warnings/fatal errors,
   * perhaps use some phpDocumentor Reflection packages (Reflection [4], 
TypeResolver [5]) if they prove to be good quality,
* in parallel, given the huge graphs it creates for huge packages like 
MediaWiki, I had the idea of creating a visualisation with D3.js to dive 
into the call graph with various zoom levels, perhaps linking the call 
graph of a plugin/extension to a high-level graph of the underlying 
software, displaying only relevant parts of it (exceptions, router, 
global functions, hooks); just an idea to be better defined and improved.

[1] https://github.com/Seb35/phpcallgraph
[2] 
https://www.mediawiki.org/wiki/File:Call_graph_of_extension_MediaWikiFarm.svg
[3] see 
https://lists.wikimedia.org/pipermail/wikitech-l/2016-November/date.html 
(in the few hours)
[4] https://github.com/phpDocumentor/Reflection
[5] https://github.com/phpDocumentor/TypeResolver

Thanks,
Seb35