fix armor slots to use npc for validation
* add ability to enable/disable machines entirely (chunkloader, mailbox,
etc)
* add ability to enable/disable machine recipes (still useable, but
uncraftable)
* fix mailboxes loosing destination setting for top-slot destination
* fix two instances where npcs would not be properly removed from the
'live' npc list (repacking and traveling to a different dimension)
* fix load/save of generated unique structures
* fix validation of unique structures during selection for generation
* default disable of submarine torpedo recipes (to match default-disable
of submarines)  if you have subs enabled, you may need to re-enable this
in order to craft ammunition
* add config option to disable npc armor swapping (temporary, may be
removed with further reworking of npc armor system)
* update version# and add release