Instructions for updating external Z3 API
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1) Add the new function to the file lib\z3_api.h
2) If the function requires logging, then add its definition to lib\api.py.
Each definition is a call to the API function in this python script.
This function has the following signature:
API(function name, return type, argument list)
The return type only needs to be specified if the function returns a Z3 object.
The file lib\api.py contains many examples.
3) Execute update_api.cmd
This script updates the .def files in the directory dll, and generates the API logging macros.

If one only wants to generate the logging macros. Then it only needs to execute
cd lib
python api.py

The script api.py generates the following files:
lib\z3_api_log.h: macros and function definitions for logging API invocations.
lib\z3_api_log.cpp
lib\z3_api_commands.cpp: bindings for z3_replayer.cpp (log interpreter)