Cookies and General Fixes

This release patches a variety of issues across the platform.

Features:

• Editor now warns when using editable class on unsupported elements
• _singular_key option for collections

Fixes:

• Resolved a number of cookie related issues accessing the editor
• Resolved potential redirect loop for client sharing login in Safari
• Resolved issue adding existing images to editable regions in Safari
• Fixed share emails not being sent in some configurations
• Fixed CommonMark attribute list saving regression
• Fixed CommonMark image URLs saving as incorrect path in some configurations
• Fixed new sites created from existing branches
• Sites with Markdown with GFM no longer cause errors in some configurations when loading editor
• Resolved a number of issues with non-ASCII characters in URLs and file paths
• Display issue preventing Add Site in Projects resolved
• Fixed upload files when all files to be uploaded are ignored
• Fixed issue with mutliple instances of tags multiselect
• Apex sites with external DNS now show Cloudflare SSL status