Add API to display document's titles in plain text without any markup

from the list:

In lots of places we need to display the title without any markup rendering. Examples:

• breadcrumb
• activity stream
• search results
  etc

This is such a common use case I'm proposing to add a new API for it in Document: getPlainTitle()
It's a one liner that will do:

getRenderedTitle("plain/1.0")