NavigateToItem.StartSearch trims double ticks before start actual searching
Use DisplayContext for type parameters

Fix #278.
Fix #279
Merge pull request #280 from vasily-kirichenko/fix-navigateto-double-ticked-idents-issue

NavigateToItem.StartSearch trims double ticks before start actual searching
Merge pull request #281 from dungpa/implement-interface

Use DisplayContext for type parameters