Code select support for field references in constructor calls with named arguments

Copied from: https://issuetracker.springsource.com/browse/STS-2241

possibly a wish

here:

def song2= new Song(title:"abc",artist:"xyz",duration:0) 

might be nice to have javadoc hovers for 'title', etc. and navigation to jump to them in the domain class.

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Although the above description is about Grails domain classes. The solution is generic and could/should be available for all similar calls to synthetic constructors. This would be a nice thing to have, but should work on content assist for these kinds of constructors first.