- Create FileSystem class:
* Move ServerConfig::CleanFilename to FileSystem::GetFileName and rewrite.
* Move ServerConfig::ExpandPath to FileSystem.
* Move ServerConfig::FileExists to FileSystem.
* Move ServerConfig::StartsWithWindowsDriveLetter to FileSystem.
- Move FileReader to fileutils.cpp and fix documentation.
- Move UserManager::DoBackgroundUserStuff to usermanager.cpp.