Merge pull request #9611 from Citadel-Station-13/supply-passive-gen

Adds passive point generation to cargo. Nerfs miasma selling. Increases mindshield crate price.

code/controllers/subsystem/shuttle.dm

@@ -37,6 +37,7 @@ SUBSYSTEM_DEF(shuttle)
 	var/points = 5000					//number of trade-points we have
 	var/centcom_message = ""			//Remarks from CentCom on how well you checked the last order.
 	var/list/discoveredPlants = list()	//Typepaths for unusual plants we've already sent CentCom, associated with their potencies
+	var/passive_supply_points_per_minute = 750
 
 	var/list/supply_packs = list()
 	var/list/shoppinglist = list()
@@ -111,6 +112,12 @@ SUBSYSTEM_DEF(shuttle)
 				qdel(T, force=TRUE)
 	CheckAutoEvac()
 
+	//Cargo stuff start
+	var/fire_time_diff = max(0, world.time - last_fire)		//Don't want this to be below 0, seriously.
+	var/point_gain = (fire_time_diff / 600) * passive_supply_points_per_minute
+	points += point_gain
+	//Cargo stuff end
+
 	if(!SSmapping.clearing_reserved_turfs)
 		while(transit_requesters.len)
 			var/requester = popleft(transit_requesters)