Use a regex to split the hxml file.

Allows skipping the "replace newlines with spaces" step, and ensures that there aren't any blank arguments.

tools/platforms/FlashPlatform.hx

@@ -67,10 +67,9 @@ class FlashPlatform extends PlatformTarget {
 				
 			}
 			
-			hxml = StringTools.replace (hxml, "\n", " ");
 			hxml = StringTools.trim (hxml);
 			
-			var args = hxml.split (" ");
+			var args = new EReg ("\\s+", "g").split (hxml);
 			var strip;
 			
 			while ((strip = args.indexOf ("-swf-header")) > -1) {