Zend.Debug.CodeAnalyzer: remove sniff

I have the impression that the Zend Code Analyzer tool as stand-alone tool is no longer available. Please correct me if I'm wrong.

I propose to remove the sniff which allowed for running that tool via PHPCS in PHPCS 4.0, along the same lines as was already done for external JS/CSS tools in commit ea52e7b.

Follow up on 277

Related to 6

Author: jrfnl

src/Standards/Squiz/ruleset.xml

@@ -28,7 +28,6 @@
     <rule ref="PEAR.Functions.ValidDefaultValue"/>
     <rule ref="PSR2.Files.EndFileNewline"/>
     <rule ref="Zend.Files.ClosingTag"/>
-    <rule ref="Zend.Debug.CodeAnalyzer"/>
 
     <!-- Lines can be 120 chars long, but never show errors -->
     <rule ref="Generic.Files.LineLength">