IsExplicitlySet returns true if and only if the given config option was set explicitly either via a command line argument or via an environment variable.

Read takes the TOML configuration file at `path`, parses it into `dest` and then uses github.com/asaskevich/govalidator to validate the struct.

SetDuration converts a command line int to a duration, and stores it in the final config.

SetDurationMinutes converts a command line minutes value to a duration, and stores it in the final config.

SetOptionalString converts a command line uint to a *string where the nil value indicates the flag was not explicitly set.

SetOptionalUint converts a command line uint to a *uint where the nil value indicates the flag was not explicitly set.

SetURL converts a command line string to a URL, and stores it in the final config.

ConfigOption is a complete description of the configuration of a command line option.

InvalidConfigError is the error that is returned when an invalid configuration is encountered by the `Read` func.

TLS represents a common configuration snippet for configuring TLS in a server process.

ConfigOptions is a group of ConfigOptions that can be for convenience initialized and set at the same time.