Clang: introduce more data in TokenInfo

Data added:
- return type spelling for functions
- parent spelling
- access specifier for class fields and methods
- storage class

New highlighting types are added, therefore
types are now categorized by class, struct, etc.

Change-Id: I1739b94a6f777045fde655060d8b9a12b6e0889b
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

tests/unit/unittest/data/highlightingmarks.cpp

@@ -331,7 +331,7 @@ void f14()
 
 using IntegerAlias = int;
 using SecondIntegerAlias = IntegerAlias;
-using IntegerTypedef = int;
+typedef int IntegerTypedef;
 using Function = void (*)();
 
 
@@ -588,3 +588,5 @@ void BaseClass::VirtualFunction() {}
 class WithVirtualFunctionDefined {
   virtual void VirtualFunctionDefinition() {};
 };
+
+namespace NFoo { namespace NBar { namespace NTest { class NamespaceTypeSpelling; } } }