Cleanup the C++ front-end.

Removed CPLUSPLUS_BEGIN/END_NAMESPACE & co and made it possible to compile the parser with CPLUSPLUS_WITHOUT_QT.

src/shared/cplusplus/Symbols.cpp

@@ -53,7 +53,7 @@
 #include "Scope.h"
 #include <cstdlib>
 
-CPLUSPLUS_BEGIN_NAMESPACE
+using namespace CPlusPlus;
 
 TemplateParameters::TemplateParameters(Scope *scope)
     : _previous(0), _scope(scope)
@@ -819,4 +819,4 @@ void ObjCMethod::visitSymbol0(SymbolVisitor *visitor)
     }
 }
 
-CPLUSPLUS_END_NAMESPACE
+