v4.2.1 - various bugfixes and documentation improvements

Fixed

• missing/incorrect documentation for _useGraphicsAsPins and _classes (#2367 & #2385)
• removed unused 'title' entry from properties.schema (#2406)
• was failing accessibility validation due to having no child elements with role="listitem" (#2426)
• v4.2.0 pin image CSS breaking third party themes (#2445)

Minimum requirements

Name	Version
Framework	3.3
Narrative	3