[NETBEANS-5577] Add PHP-CS-Fixer 3.x configuration files

https://issues.apache.org/jira/browse/NETBEANS-5577

Added configuration files `.php-cs-fixer.php` and `.php-cs-fixer.dist.php` to Important files.
Reference:
- https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/3.0/UPGRADE-v3.md
- PHP-CS-Fixer/PHP-CS-Fixer#5607

php/php.code.analysis/src/org/netbeans/modules/php/analysis/ImportantFilesImpl.java

@@ -36,8 +36,10 @@ public final class ImportantFilesImpl implements ImportantFilesImplementation {
             CodeSniffer.DOT_CONFIG_FILE_NAME,
             CodeSniffer.DIST_CONFIG_FILE_NAME,
             CodeSniffer.DIST_DOT_CONFIG_FILE_NAME,
-            CodingStandardsFixer.CONFIG_FILE_NAME,
-            CodingStandardsFixer.DIST_CONFIG_FILE_NAME,
+            CodingStandardsFixer.CONFIG_FILE_NAME_V2,
+            CodingStandardsFixer.DIST_CONFIG_FILE_NAME_V2,
+            CodingStandardsFixer.CONFIG_FILE_NAME_V3,
+            CodingStandardsFixer.DIST_CONFIG_FILE_NAME_V3,
             PHPStan.CONFIG_FILE_NAME,
             PHPStan.DIST_CONFIG_FILE_NAME};
 

php/php.code.analysis/src/org/netbeans/modules/php/analysis/commands/CodingStandardsFixer.java

@@ -87,8 +87,10 @@ public final class CodingStandardsFixer {
             NO_INTERACTION_PARAM);
 
     // configuration files
-    public static final String CONFIG_FILE_NAME = ".php_cs"; // NOI18N
-    public static final String DIST_CONFIG_FILE_NAME = ".php_cs.dist"; // NOI18N
+    public static final String CONFIG_FILE_NAME_V2 = ".php_cs"; // NOI18N
+    public static final String DIST_CONFIG_FILE_NAME_V2 = ".php_cs.dist"; // NOI18N
+    public static final String CONFIG_FILE_NAME_V3 = ".php-cs-fixer.php"; // NOI18N
+    public static final String DIST_CONFIG_FILE_NAME_V3 = ".php-cs-fixer.dist.php"; // NOI18N
 
     @org.netbeans.api.annotations.common.SuppressWarnings(value = "MS_MUTABLE_COLLECTION", justification = "It is immutable") // NOI18N
     public static final List<String> VERSIONS = Arrays.asList(