* Preserve the environment table so that it must
only be regenerated after a game restart, after
a computer is restarted, and at the tiem of the
initialization of a computer.
* Replace the current meta-based userdata
mechanisms with a global `ram` variable within the
environment, as the preservation of the environment
itself causes its global variables to be preserved
as well
* Make `get_attr` convert meta to a table before
accessing the requested key in order to ensure that
the meta can be correctly accessed even if it is
not a string
* Initialize output_editable meta on node place
* Add clear to help
* Add off/shutdown to help
* Add reboot/restart to help
* Sort help alphabetically
* Ensure that start.lua is automatically run after
the filesystem is reinitialized in order to prevent
the output buffer from being empty
