Merge changes I0ca8c2c7,If879f5bb,I98de44a0,Iac57e039,Ie98edbef,Ib4e68f45,I7eca30aa,Ie4fdf4d7

* changes:
  Perform plugin cleanup in the background
  Permit restarting a specific plugin
  Provide a data directory to plugins on demand
  Export ServerInformation to extensions and plugins
  Enable aliases for SSH commands
  Enable multiple bindings during auto registration
  Allow seeing plugins without the PluginLoader lock
  Fix sorting of SSH help text