* added CanonicalFilePathCache to also reserve the initially recorded casing of file names
* use canonical file path cache to resolve filepaths in names of symbols (anonymous, static, ...)
* null reference fixes
* made header and excluded filepaths of filemanager canonical
* implemented solving Attributed- and InjectedClassNameType
* handled clang returning null objects in NameResolvers
* added classes that represent different name kinds
* rewrote NameResolvers to return the new name classes instead of NameElement and NameHierarchy
* removed DataType classes since their functionality moved to the CxxTypeName class.
* 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
mlangkabel