Don't use FILE_ATTRIBUTE_NORMAL, it's a "magic" value for something
else. To check if a file is a regular file, we need to check if it's
NOT a directory (or a device).
The new class Path only holds a string pointer without being
responsible for allocation/deallocation. The FileSystem.hxx library
accepts Path arguments instead of AllocatedPath, to avoid forcing
callers to allocate another string object.
- DirectoryReader is extracted to separate header
- FileSystem.cxx/FileSystem.hxx/DirectoryReader.hxx moved to fs/ subdir
- Functions return true on success, instead of 0 (where applicable)
- ReadLink return result instead of out parameter
- UnlinkFile is renamed to RemoveFile
- CheckExists/CheckIsRegular/CheckIsDirectory are renamed
to PathExists/FileExists/DirectoryExists