Cold Reactions and Applejack

Adds the ability to make a chemical reaction only occur when at or below
a specified temperature.

Adds new reaction for freezing water into ice
- Must be at or below 270K to turn water to ice

Adds two new reagents/drinks: Applejack and Jack Rose cocktail
-Applejack is obtained by freezing cider at or below 270K
- Applejack is slightly more potent than cider, due to it's alcohol
concentration being higher
- Jack Rose is a new mixed drink that is 4 parts Applejack, 1 part Lemon
Juice

Only Ice and Applejack utilize the cold reactions at this time, but the
functionality is in place for future reactions.
- This should allow coders more flexibility with defining new reactions
that may realistically occur at low temperatures.

Renamed the existing "required_temp" variable for reactions to
"min_temp" to better communicate it's purpose and differentiate it from
the new "max_temp" variable for cold reactions.

code/modules/research/xenoarchaeology/chemistry.dm

@@ -74,7 +74,7 @@ datum
 			secondary_results = list("chemical_waste" = 1)
 			required_reagents = list("density_separated_sample" = 5)
 			result_amount = 4
-			required_temp = 375
+			min_temp = 375
 
 /obj/item/weapon/reagent_containers/glass/solution_tray
 	name = "solution tray"