- fix not throwing exception and stucked at loading when there is an error while script loading

- changed script async loader to bukkit/bungee based so that to make the script load after all plugins have been enabled

fix not throwing exception and stucked at loading when there is an error while script loading

- added cache strategy for groovy scripts

Plugin: now in 4 lifecycle hooks: OnScriptLoad OnEnable OnDisable OnScriptUnload are now running synchronously