IList<BlockData> created several issues

Description

Fixed the following issues when you added a property such as the following to any page type:

{{public virtual IList<EditorialBlock> Blocks { get; set; }}}

• The IList block created a new draft version automatically right after publishing, despite having no changes.
• You had to click twice to collapse list items
• List items were expanded when you reloaded APE edit mode.
• Each item looked the same, with just a type as the header text.