Support launching an arbitrary mod. Hook up package detection for cnc.

OpenRA.Launcher.Mac/Mod.m

@@ -17,6 +17,7 @@
 @synthesize description;
 @synthesize requires;
 @synthesize standalone;
+@synthesize baseURL;
 
 + (id)modWithId:(NSString *)mod fields:(id)fields baseURL:(NSURL *)url
 {
@@ -54,9 +55,4 @@
 	[super dealloc];
 }
 
-- (NSURL *)pageURL
-{
-	return [baseURL URLByAppendingPathComponent:@"mod.html"];
-}
-
 @end