load
Load a ToolConfig from configFile if it exists, or return a default instance.
The YAML text is pre-processed to expand ${VAR_NAME} placeholders before parsing. Unknown YAML keys are silently ignored.
Parameters
configFile
Path to rewriterunner.yml. May be null or point to a non-existent file; in either case a default ToolConfig is returned.
logger
Optional logger for warnings during config loading.