Added Stealth tech and Stealth Bombers (#4271)

* Changed some interception-related uniques

- "Can not be intercepted" -> "Cannot be intercepted"
  This really irked me, and the new version is also how it is written
  in the wiki.
- "Reduces damage taken from interception by 50%" ->
  "Damage taken from interception reduced by [50]%"

* Added "Cannot be carried by [unitFilter] units" unique

* Added an icon for Stealth

* Added Stealth technology and the Stealth Bomber

* Possibly fixed incorrect rounding for interception damage bonus

* Various code style changes

* Made Stealth Bomber interceptable, but with 100% damage reduction

android/assets/jsons/Civ V - Vanilla/Units.json

@@ -1134,7 +1134,7 @@
 		"cost": 375,
 		"requiredTech": "Radar",
 		"requiredResource": "Oil",
-		//"upgradesTo": "Stealth Bomber",
+		"upgradesTo": "Stealth Bomber",
 		"attackSound": "shot"
 	},
 	{
@@ -1150,7 +1150,7 @@
 		"requiredTech": "Radar",
 		"requiredResource": "Oil",
 		"promotions": ["Evasion", "Siege I"],
-		//"upgradesTo": "Stealth Bomber",
+		"upgradesTo": "Stealth Bomber",
 		"attackSound": "shot"
 	},
 	{
@@ -1350,22 +1350,19 @@
 		"requiredResource": "Uranium",
 		"uniques": ["Can move after attacking", "No defensive terrain bonus"]
 	},
-	/*
 	{
 		"name": "Stealth Bomber",
 		"unitType": "Bomber",
 		"movement": 2,
 		"strength": 85,
-		"rangedStrength": 65,
+		"rangedStrength": 85,
 		"range": 20,
 		"cost": 425,
 		"requiredTech": "Stealth",
 		"requiredResource": "Aluminum",
-		"uniques": ["Evasion", "6 tiles in every direction always visible"],
+		"uniques": ["Damage taken from interception reduced by [100]%", "Cannot be carried by [Carrier] units", "6 tiles in every direction always visible"],
 		"attackSound": "shot"
-		// cannot be based on carrier
 	},
-	*/
 
 	/* Great people */