message: adds a test for GetEnvironmentVariable
diff: @@ -46,5 +46,8 @@ void main()
  string sInValidResRef = "aaaaaaaaaaaaaaaa";
  report("IsValidResRef", NWNX_Util_IsValidResRef(sInValidResRef, NWNX_UTIL_RESREF_TYPE_ITEM) == 0);
  + string sEnvVar = "NWNX_CORE_LOG_LEVEL";
  + report("GetEnvironmentVariable", StringToInt(NWNX_Util_GetEnvironmentVariable(sEnvVar)) > 0);
  +
  WriteTimestampedLogEntry("NWNX_Util unit test end.");
  }
  