Nutrient Split and Diet Flag

Adds Protein and Plant-matter reagents, nutritional values of 15

Reduces nutritional value of Nutriment to 12, down from 15

Adds new flag defines for racial diets, and new dietflags var to species
(must be set manually in the species definition, otherwise it will be
null)

Assigns each species their respective diet's flag:
- Carnivores: Unathi, Slime People
- Omnivores: Human, Tajaran, Kidan, Vox, IPC, Shadowpeople, Golems,
Plasmaman, Nucleation, Vox Armalis
- Herbivores: Skrell, Diona, Grey, Wryn

Adds checks to all nutrient on_mob_life procs to handle simple_animals
versus carbon/human mobs
- Simple animals will heal from any nutrient source, but don't gain
nutritional value since they don't appear to deplete it

Adds check to Nutriment on_mob_life proc to ensure that the diet for a
species has been set
- Failure to set a diet flag will prevent the species from benefitting
from ANY nutrients, while metabolizing the reagents normally
- This is largely for ensuring the species is properly defined

Adds checks to Protein and Plant-matter on_mob_life procs to handle
incompatible diets
- Ingesting Protein does not benefit Herbivores, but will metabolize out
of the body normally
-Ingesting Plant-matter does not benefit Carnivores, but will metabolize
out of the body normally

code/modules/reagents/Chemistry-Reagents.dm

@@ -1485,10 +1485,31 @@ datum
 /////////////////////////Food Reagents////////////////////////////
 // Part of the food code. Nutriment is used instead of the old "heal_amt" code. Also is where all the food
 // 	condiments, additives, and such go.
-		nutriment
+		nutriment		// Pure nutriment, universally digestable and thus slightly less effective
 			name = "Nutriment"
 			id = "nutriment"
-			description = "All the vitamins, minerals, and carbohydrates the body needs in pure form."
+			description = "A questionable mixture of various pure nutrients commonly found in processed foods."
+			reagent_state = SOLID
+			nutriment_factor = 12 * REAGENTS_METABOLISM
+			color = "#664330" // rgb: 102, 67, 48
+
+			on_mob_life(var/mob/living/M as mob)
+				if(!M) M = holder.my_atom
+				if(!(M.mind in ticker.mode.vampires))
+					if(ishuman(M))
+						var/mob/living/carbon/human/H = M
+						if(H.species && H.species.dietflags)	//Make sure the species has it's dietflag set, otherwise it can't digest any nutrients
+							H.nutrition += nutriment_factor	// For hunger and fatness
+							if(prob(50)) M.heal_organ_damage(1,0)
+					if(istype(M,/mob/living/simple_animal))		//Any nutrients can heal simple animals
+						if(prob(50)) M.heal_organ_damage(1,0)
+				..()
+				return
+
+		protein			// Meat-based protein, digestable by carnivores and omnivores, worthless to herbivores
+			name = "Protein"
+			id = "protein"
+			description = "Various essential proteins and fats commonly found in animal flesh and blood."
 			reagent_state = SOLID
 			nutriment_factor = 15 * REAGENTS_METABOLISM
 			color = "#664330" // rgb: 102, 67, 48
@@ -1496,8 +1517,34 @@ datum
 			on_mob_life(var/mob/living/M as mob)
 				if(!M) M = holder.my_atom
 				if(!(M.mind in ticker.mode.vampires))
-					M.nutrition += nutriment_factor	// For hunger and fatness
-					if(prob(50)) M.heal_organ_damage(1,0)
+					if(ishuman(M))
+						var/mob/living/carbon/human/H = M
+						if(H.species && H.species.dietflags && !(H.species.dietflags & DIET_HERB))	//Make sure the species has it's dietflag set, otherwise it can't digest any nutrients
+							H.nutrition += nutriment_factor	// For hunger and fatness
+							if(prob(50)) M.heal_organ_damage(1,0)
+					if(istype(M,/mob/living/simple_animal))		//Any nutrients can heal simple animals
+						if(prob(50)) M.heal_organ_damage(1,0)
+				..()
+				return
+
+		plantmatter		// Plant-based biomatter, digestable by herbivores and omnivores, worthless to carnivores
+			name = "Plant-matter"
+			id = "plantmatter"
+			description = "Vitamin-rich fibers and natural sugars commonly found in fresh produce."
+			reagent_state = SOLID
+			nutriment_factor = 15 * REAGENTS_METABOLISM
+			color = "#664330" // rgb: 102, 67, 48
+
+			on_mob_life(var/mob/living/M as mob)
+				if(!M) M = holder.my_atom
+				if(!(M.mind in ticker.mode.vampires))
+					if(ishuman(M))
+						var/mob/living/carbon/human/H = M
+						if(H.species && H.species.dietflags && !(H.species.dietflags & DIET_CARN))	//Make sure the species has it's dietflag set, otherwise it can't digest any nutrients
+							H.nutrition += nutriment_factor	// For hunger and fatness
+							if(prob(50)) M.heal_organ_damage(1,0)
+					if(istype(M,/mob/living/simple_animal))		//Any nutrients can heal simple animals
+						if(prob(50)) M.heal_organ_damage(1,0)
 				..()
 				return