[Gameplay A24] - Change nisean_horses technology.

Nisean war horses were reserved for the heaviest shock cavalry (i.e.
champion spearmen in 0 A.D.).
- Limit to Champion Cavalry Spearmen.
- Increase training time by 10%.
- Food cost raised to 400.
- Made the "Horse Breeding" technology a requirement.

Original patch by: @borg-
Taken over by: @Nescio
Reviewed by: @borg-
Comments by: @Feldfeld, @Palaxin, @ValihrAnt
This was SVN commit r24589.

binaries/data/mods/public/simulation/data/technologies/nisean_horses.json

@@ -5,27 +5,29 @@
 	},
 	"description": "The now-extinct Nisian breed of horse was one of the largest and robust horses of ancient times. They were highly sought after by the Seleucids and Persians as both rider and mount gained heavier armor as time progressed.",
 	"cost": {
-		"food": 200,
+		"food": 400,
 		"metal": 200
 	},
+	"supersedes": "cavalry_health",
 	"requirements": {
 		"all": [
 			{ "tech": "phase_city" },
 			{
 				"any": [
-					{ "civ": "sele" },
-					{ "civ": "pers" }
+					{ "civ": "pers" },
+					{ "civ": "sele" }
 				]
 			}
 		]
 	},
 	"requirementsTooltip": "Unlocked in City Phase.",
-	"icon": "nisean_war_horses.png",
+	"icon": "chamfrom.png",
 	"researchTime": 60,
-	"tooltip": "Cavalry +20% health.",
+	"tooltip": "Champion Cavalry Spearmen +20% health, but +10% training time.",
 	"modifications": [
+		{ "value": "Cost/BuildTime", "multiply": 1.1 },
 		{ "value": "Health/Max", "multiply": 1.2 }
 	],
-	"affects": ["Cavalry"],
+	"affects": ["Champion Cavalry Spearman"],
 	"soundComplete": "interface/alarm/alarm_upgradearmory.xml"
 }