JBIDE-18012 For JBIDE 4.2.0.CR1: Ensure copyrights and provider names are correct in all plugins and features [JST]
JBIDE-17993 Default ionic js/css references for ionic palette components

Default js/css libraries are registered with an extension point.
Methods are added to IHTMLLibraryVersion that check if a library
is preferred and if it is already referenced by a file.