Merge pull request #278 in ZP/z-push from bugfix/ZP-805-update-class-constructors to feature/ZP-804-php-7-compatibility

* commit '7b0d5004': (32 commits)
  ZP-805 Update class constructors.
  ZP-805 Update class constructors.
  ZP-960 Other fatal PHP 7 errors.
  ZP-805 Renamed constructors to __construct(). And updated calls to parent class creators for classes Recurrence and TaskRecurrence. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor BackendSearchLDAP() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructors  to __construct(). Updated Combined to call parent::__construct. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor ZPushTop() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor Mail_mimeDecode() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor WBXMLEncoder() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor WBXMLDecoder() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor for all classes to __construct(). Updated Streamer to call __construct() function of the class in unserialize(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor for parent from parent::HierarchyCache() to parent::__construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor ExportChangesDiff() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor ImportChangesDiff() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor SearchProvider() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor Backend() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor FileStateMachine() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor Streamer() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor ImportChangesStream() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-805 Renamed constructor SyncCollections() to __construct(). Released under the Affero GNU General Public License (AGPL) version 3.
  ...