Clang: Indicate available "fix its" with a light bulb

...at the end of the line, just like for the "Apply Function Signature
Changes" refactor action.

* Hovering the light bulb shows the tooltip "Inspect available fixits".
* Clicking the light bulb leads to the refactoring menu, as if the user
  hit Alt+Return.

Change-Id: Iaf7b3734c43e21fc28e6b0658f517d98858c0e0c
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/cpptools/baseeditordocumentprocessor.h

@@ -74,7 +74,8 @@ public:
 signals:
     // Signal interface to implement
     void codeWarningsUpdated(unsigned revision,
-                             const QList<QTextEdit::ExtraSelection> selections);
+                             const QList<QTextEdit::ExtraSelection> selections,
+                             const TextEditor::RefactorMarkers &refactorMarkers);
 
     void ifdefedOutBlocksUpdated(unsigned revision,
                                  const QList<TextEditor::BlockRange> ifdefedOutBlocks);