Feature suggestion: Add function to return the fujinet-lib version.

However it makes most sense.. could return a char *, could take a char* as a param and fill it, or could take 3 int pointers and fill thos with the major.minor.patch, etc. I like the first, that way can do something simple like "printf("Version: %s", fn_get_lib_version())" or something like that..

Start by locating the public fujinet-lib API and the existing version information. Define the requested fn_get_lib_version() entry point according to the issue's preferred string-returning usage, and verify that callers can obtain the library version as shown in the request.

Written by the indexing model from the issue text.