Added a configuration map that can be loaded from a properties file on startup. The file can be specified in mirth.properties. Users can edit the configuration map and save it from the Administrator in the settings panel, which will write it back out to the file specified in configuration map. The configuration map be used anywhere the global map can be used via configurationMap or $cfg. The $() syntax will also attempt to retrieve from the configuration map after the global map
Issue: MIRTH-1958