QmlJS: Improve completion of signals.
* Change from Reference to FunctionValue: There was no reason for them being References as the argument types never need lookup. * Enumerate in global completion: When you define 'signal foo(int a)' you now get completion for 'foo' and will get the function argument hint popup. Change-Id: Ic348db477a34ba468dfdb690499a9cd8fd605cd2 Reviewed-on: http://codereview.qt-project.org/4774Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>
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