Add "new" keyword to migration, foothills, and coast range

Fixes #7362

binaries/data/mods/public/maps/random/coast_range.json

@@ -4,7 +4,7 @@
 		"Script": "coast_range.js",
 		"Description": "All players starts on a continent surrounded by water.\n\n[color=\"red\"]IMPORTANT NOTE: This map is designed and balanced for 2 teams only.[/color]\n",
 		"Preview": "coast_range.png",
-		"Keywords": [ "multiplayer" ],
+		"Keywords": ["multiplayer", "new"],
 		"SupportedBiomes": "generic/",
 		"CircularMap": true,
 		"PlayerPlacements": [

binaries/data/mods/public/maps/random/foothills.json

@@ -4,7 +4,7 @@
 		"Script" : "foothills.js",
 		"Description" : "A land map with rolling hills and no obstructions.",
 		"Preview" : "foothills.png",
-		"Keywords": ["multiplayer"],
+		"Keywords": ["multiplayer", "new"],
 		"SupportedBiomes": "generic/",
 		"CircularMap" : true,
 		"PlayerPlacements": [

binaries/data/mods/public/maps/random/migration.json

@@ -3,7 +3,7 @@
 		"Name" : "Migration",
 		"Script" : "migration.js",
 		"Description" : "Players start on islands towards the outside of the map and must move to take advantage of the middle island before their resources run out.",
-		"Keywords": ["naval"],
+		"Keywords": ["naval", "new"],
 		"Preview" : "migration.png",
 		"SupportedBiomes": "generic/",
 		"CircularMap" : true,