* moved source code for solving names of NestedNameSpecifiers to new CxxSpecifierNameResolver.
* implemented recording of UsingDirectives.
* implemented using file as context for using directives and using directive decls if no other context is available.
* re-implemented recording of the auto keyword
* revised check for visiting a referenced type or decl
* calling client->onFileParsed everytime a file gets processed by the Preprocessor so we can create valid locations in that file
* created test for detecting a usage of a member inside a CallExpression context
* added method to consume a context based reference kind in the AstVisitor
malte_langkabel