Move getChildListThatStartsWithOpenerToken inside getSignatureHelpItems
Reenable some basic generics tests
Parser changes to parse omitted types correctly
Split genericParameterHelp test into multiple tests
Remove OmittedType
Signature Help relies on display building routines in checker
Produce SignatureHelpParameters from type parameters for generic help
Address PR feedback
Merge branch 'master' into sigHelp
Merge pull request #915 from Microsoft/sigHelp

Basic generic signature help