iPanorama 360° - Virtual Tour Builder for WordPress 1.9.1

* Fix: resolved 403 errors occurring when strict HTTP standards enforcement is enabled

* Mod: lazy load mode – panorama is loaded only when visible in the web view screen
* New: toggle the white logo

* Fix: issue with marker position depending on device pixel ratio (devicePixelRatio)

* Fix: support iframe for popup and tooltip data

* Fix: scene transition effects, black screen
* Fix: tooltip & popover data sanitization

* Fix: unauthorized access to preview of deactivated panoramas for sub+ users

* Fix: constant FILTER_SANITIZE_STRIPPED is deprecated
* Fix: unauthorized access to config.json of deactivated panoramas

* Fix: unauthorized access to view deactivated panoramas

* Fix: feedback form
* Fix: SQL injection via shortcode

Fix: SQL injection vulnerability (list-table-items.php)