Rewrote PrettyPrinter to output the document exactly as it was before

This means at the moment the PrettyPrinter isn't doing anything useful,
but the idea is that from here we can improve it to adapt the code to
a certain style.

Reviewed-by: Roberto Raggi

src/shared/cplusplus/ASTVisitor.h

@@ -67,6 +67,7 @@ public:
     Control *control() const;
     TranslationUnit *translationUnit() const;
 
+    unsigned tokenCount() const;
     const Token &tokenAt(unsigned index) const;
     int tokenKind(unsigned index) const;
     const char *spell(unsigned index) const;