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f819dc9345
Layers are now constructed per file, not per source type. This will allow us to report precise position where bad configuration variable is set. Because layers are now created per file, it makes sense to require existence of the file, instead of ignoring missing files which would leave an empty layer in the stack. The path existence is tested by ConfigEnv::existing_config_path(), so I simply made the new load_file/dir() methods stricter. However, we still need config::File::required(false) flag in order to accept /dev/null as an empty TOML file. The lib type is renamed to StackedConfig to avoid name conflicts. The cli LayeredConfigs will probably be reorganized as an environment object that builds a StackedConfig.