Battlegrounds 2 gamedata support (bug 4146, r=dvander).

gamedata/core.games/common.games.txt

@@ -134,6 +134,7 @@
 			"game"					"empires"
 			"game"					"gesource"
 			"game"					"NeotokyoSource"
+			"game"					"bg2"
 		}
 
 		"Keys"
@@ -152,6 +153,7 @@
 			"game"					"dod"
 			"game"					"empires"
 			"game"					"NeotokyoSource"
+			"game"					"bg2"
 		}
 		
 		"Keys"
@@ -173,6 +175,7 @@
 			"game"					"ageofchivalry"
 			"game"					"obsidian"
 			"game"					"zombie_master"
+			"game"					"bg2"
 		}
 		
 		"Keys"

gamedata/core.games/engine.ep2.txt

@@ -18,6 +18,7 @@
 		{
 			"game"		"ageofchivalry"
 			"game"		"zps"
+			"game"		"bg2"
 		}
 		
 		"Offsets"

gamedata/sdktools.games/engine.ep2.txt

@@ -20,6 +20,7 @@
 			"game"		"zps"
 			"game"		"empires"
 			"game"		"synergy"
+			"game"		"bg2"
 		}
 
 		"Offsets"
@@ -120,6 +121,7 @@
 			"game"		"zps"
 			"game"		"empires"
 			"game"		"synergy"
+			"game"		"bg2"
 		}
 		
 		"Offsets"

gamedata/sdktools.games/master.games.txt

@@ -139,4 +139,8 @@
 	{
 		"game"		"NeotokyoSource"
 	}
+	"game.bg2.txt"
+	{
+		"game"		"bg2"
+	}
 }