When creating your own plug-ins, the following is a list of default plug-in properties passed into all plug-ins:
${PLUGIN_INPUT_PROPS}-input props location
${PLUGIN_OUTPUT_PROPS}-output props location
${AH_WEB_URL}-the external url of the server
${PLUGIN_HOME}-the base directory of the plugin being run
These are all set as environment properties of the plugin step and are able to be referenced in the command using the format ${PLUGIN_HOME}.
