Instructions for updating external Z3 API
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The python "macros": def_Type() and def_API() are used to add new types and function definitions to the Z3 API.
The .h files provided to `mk_bindings(API_files)` contain these definitions.
See src\api\z3_api.h for many examples.

The bindings for .Net and Python are generated when mk_make.py is invoked.

