Extended Vendor UI

v1.8.5
- Updated interface version for patch 8.2.
- Fixed a slot filter related lua error.
- Removed the scaling option from the configuration options.
- Changed the behavior of how options are saved in configuration panels: Instead of changes taking effect instantly upon checking/unchecking boxes and reverting when the Cancel button is clicked, changes
now only take effect when the Okay button is clicked; otherwise no changes are made at all.
- Added a "Save" button to the Quick Vendor configuration panel below the option checkboxes; as a result of the aforementioned change to configuration behavior, this Save button must be used to apply changes
made in the Quick Vendor configuration panel.