Introducing Utils API

It opens APIs to

 Utils
 DisplayThread,
 EclipseUtils,
 EditorUtils,
 FileUtils,
 OSGiUtils,
 ScalaWordFinder,
 SWTUtils
Documents the Utils API
Renaming [Pp]imped(\w+) to Rich\1
Switches to toplevel objects with public/private members

Fixes #1002247
Merge pull request #815 from huitseeker/issue/UtilsAPI

An API for Util methods