Split Objective-C keyword parsing to handle the '@' separately.

Because apparently, while designing the Objective-C language, somebody
thought it was a world-class idea to allow any white-space between the
'@' character and the subsequent keyword. With this fix, we now
correctly parse:
    @  dynamic
and:
    @
      selector
and:
    @"foo"
     "bar"
    @"mooze"
(This last one is 1 single string split over multiple lines.)
Wonderful, isn't it?

What we (and Clang) do not support, but what GCC supports is something
like:
   @"foo"@@  "bar"  @"mooze"  @@
which is equivalent to @"foobarmooze".

src/plugins/cpptools/cppcodecompletion.h

@@ -89,6 +89,7 @@ public:
     void setPartialCompletionEnabled(bool partialCompletionEnabled);
 
 private:
+    void addKeyword(const QString &text);
     void addKeywords();
     void addMacros(const QString &fileName, const CPlusPlus::Snapshot &snapshot);
     void addMacros_helper(const CPlusPlus::Snapshot &snapshot,