adds special low profile indicator signs for doppler maps (the nlp) #884

Icon difference rendering

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Icons with diff:

ADDED - modular_doppler/nlp_decoration/icons/semiotic.dmi (0)

State Name (duplicate)	Old Icon	New Icon	Status
pressure (0)			Created
gravity (0)			Created
no_gravity (0)			Created
cryo (0)			Created
radiation_shelter (0)			Created
low_radiation (0)			Created
high_radiation (0)			Created
airlock (0)			Created
bulkhead (0)			Created
vacuum_ahead (0)			Created
warning (0)			Created
exhaust (0)			Created
refridgeration (0)			Created
galley (0)			Created
arrow (0)			Created
bridge (0)			Created
medical (0)			Created
maintenance (0)			Created
ladderwell (0)			Created
radio (0)			Created
storage (0)			Created
food_storage (0)			Created
cold_food_storage (0)			Created
(0)			Created