Track Leonie HEAD to get ObjC method call instructions.
You can now pass NULL to COperatorNode's AddParam() to reserve space for a param, then use SetParamAtIndex() to actually fill it later.
We now parse ObjC method calls and generate a native call expression for it.

For this to work, you need to have called LEOLoadNativeHeadersFromFile() on a specially-formatted text file containing information on all the classes and methods.