Load prepares the environment for processing the configuration file for the application command, where `name` is the default filename to be searched for in `Paths`, otherwise, if set, `file` will override the search and point, and then reads the file into `Viper`.

NewLoadError creates a new `LoadError` error type with the provided `file` and `message` about the error, and the `err` from the upstream library.

NewNotFoundError creates a new `NotFoundError` error type with the provided `file` and `message` about the error, and the `err` from the upstream library.

Paths sets the default paths which will be used to look for the default configuration file for each of the application commands.