Inline CSS for mail templates is now optional.

UX/UI Improvements

• Increased the visibility of the close button in modal popups
• Added favicon to backend login page

API Changes

• Added .xml as a valid default asset file extension
• Added fit method for resizing cropped images
• Added model.relation.beforeAttach, model.relation.afterAttach, model.relation.beforeDetach, model.relation.afterDetach events
• Added readOnly support for switch and checkbox field types
• Added getLayout() method to the CMS Controller
• Added ability for paneCssClass to define one class to be applied to all tab panes
• Made automatically inlining brand CSS in email layouts optional

Bug Fixes

• Numerous code quality improvements
• Fixed issue with NestedTree on SQL Server: "A column has been specified more than once in the order by list. Columns in the order by list must be unique."
• Added unit tests for the image Resizer class
• Improved backend compatibilty with CloudFlare's RocketLoader
• Fixed input trigger on source field types with multiple selected values

Translation Improvements

• Additions to the Russian translation