[gameplay] A24 Cavalry build time increase / speed tech cost increase

Slight debuff for cavalry: increase their build time but slightly above
10%, and increase the cost of the +10% movement speed technology.

Accepted By: FeldFeld, borg-, Nescio
Differential Revision: https://code.wildfiregames.com/D3476
This was SVN commit r24799.

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

@@ -2,8 +2,8 @@
 	"genericName": "Horse Racing",
 	"description": "Train your horses to move faster.",
 	"cost": {
-		"food": 200,
-		"metal": 100
+		"food": 400,
+		"metal": 200
 	},
 	"requirements": { "tech": "phase_village" },
 	"requirementsTooltip": "Unlocked in Village Phase.",

binaries/data/mods/public/simulation/templates/template_unit_cavalry.xml

@@ -17,7 +17,7 @@
     </Slaughter>
   </Attack>
   <Cost>
-    <BuildTime>16</BuildTime>
+    <BuildTime>18</BuildTime>
     <Resources>
       <food>100</food>
     </Resources>

binaries/data/mods/public/simulation/templates/template_unit_champion_cavalry.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Entity parent="template_unit_champion">
   <Cost>
-    <BuildTime>27</BuildTime>
+    <BuildTime>30</BuildTime>
     <Resources>
       <food>150</food>
       <wood>80</wood>