No ATTENUATION_MODELS enum in C API header

[ns-studios]

Expected behavior: enum ATTENUATION_MODELS with attenuation constants is defined in soloud_c.h

Actual behavior: enum ATTENUATION_MODELS is not defined in soloud_c.h

Steps to reproduce the problem: Open include/soloud_c.h, look for ATTENUATION_MODELS, it's not there.

SoLoud version, operating system, backend used, any other potentially useful information: SoLoud 202002, Windows 10 22h2