[AP] Style Suite 2.16.15

• Fix case sensitivity of color name validation

• Fix missing "repeat" and "size" CSS for profile headers
• Fix issue where profile header position was hardcoded to 50%
• Fix issue where avatar frames sometimes stretch to fit a container (approval queue, article list)
• Fix issue where color names were rejected from the validator

• Create "Bandcamp" profile block
• Create "Apple Music" profile block
• Add missing "Can change cursor" profile style permission
• Fix Undefined array key "date"
• Improve reliability of importing icons during the 2.15.0 upgrade step

• UI.X Classic: Fix issue where a regular color could be seen underneath an inner-text animation/color gradient
• Don't pass an empty inner-text animation to htmlspecialchars()
• Improve reliability of 2.15.0 upgrade step

• Create "radius" option for avatar frames
• Change default bbcode column from varchar to text
• Fix color validation regression
• Fall back to "square" if the frame has no shape option set

• Various profile preview fixes
• Enforce a stricter check when updating asset_url during 2.16.8 upgrade
• Fix issue where image position etc could not update unless the uploaded image was also changed
• Fix Cannot access offset of type string on string

• Fix Argument #1 ($string) must be of type string, array given when "Font awesome icon styling type" is set to "inherit"
• Fix various style preview issues
• Soft-require Zlib in asset optimization job for font conversion

• Create "View custom blocks" permission so guests that cant change block settings can still view registered members blocks
• Address reports of an assets stored URL not reflecting the new data directory structure
• Fix another formatSelectableColors(): Argument #1 ($colors) must be of type string, null given
• Don't generate a tooltip when hovering over the avatar frame preview
• Allow "avatar--square" to be applied even if "no-avatar-frame" is set
• Fix issue where inner-text animations / color gradients bottom layer was still colored
• Fix thread participant avatar placement

• Correctly apply postbit background color
• Fix Argument 1 ($entity) must be type of Entity, null given
• Enforce a stricter check before applying text icons
• Fix Argument #1 ($colors) must be type string, null given

• Fix Undefined array key "content" when editing a users profile block from the admin panel
• Set a default null value for ap_ss_username_colors
• Fix Attempted to convert NULL to integer [user_group_id]