WhatsApp Chat Support Pro WordPress Plugin 3.3.0

* Added: New Floating layout called Pre-Chat Message.
* Added: New Floating layout called Multi-Agent Form.
* Added: Filter by Agents option in the leads dashboard.
* Fixed: Some documentation page links.

* Improved: General codebase improvements.

* Fixed: A critical Broken Access Control vulnerability in REST API.
* Security: Ensured all data is properly sanitized, validated, and escaped.

* NEW: Position bubble button from screen with specific dimension.
* NEW: Added positioning option for floating chatbox.
* NEW: Added all icon sets from icofont library.
* NEW: Renamed option tabs names.
* NEW: Order admin options for better access.
* NEW: Added button tooltip.
* Update: Code compatibility.
* TESTED: WordPress 6.6.2 compatibility.

- Update: Code structure
- Update: Code compatibility with latest WordPress version
- Update: Code compatibility with latest PHP version
- Added: New text fields

- Updated third-party assets

Fixed some CSS issues