-Added method flags to global constants for script

-Added a new flag METHOD_FLAG_FROM_SCRIPT to get_method_list() flag property. Closes #3489

core/method_bind.h

@@ -50,6 +50,7 @@ enum MethodFlags {
 	METHOD_FLAG_CONST=8,
 	METHOD_FLAG_REVERSE=16, // used for events
 	METHOD_FLAG_VIRTUAL=32,
+	METHOD_FLAG_FROM_SCRIPT=64,
 	METHOD_FLAGS_DEFAULT=METHOD_FLAG_NORMAL,
 };