GetConfigDir get the config directory value from a Variables variable value (if it exists) or uses passed in value or default if previous result in blank.

GetConfigFileName gets the configuration filename value from a Variables variable value (if it exists) or uses passed in value.

GetStartupInfo gets the Service StartupInfo values from an Variables variable value (if it exists) or uses the default values.

NewVariables constructor reads/stores os.Environ() for use by Variables receiver methods.

StartupInfo provides the startup timer values which are applied to the StartupTimer created at boot.

Variables is a receiver that holds Variables and encapsulates toml.Tree-based configuration field overrides.