Allow disabling signal handling, turn signal handling off by default.

CInterface/Core.cpp

@@ -7,7 +7,7 @@ std::string ExceptionHandler::_ArbutilsLastException = "";
 /// @brief Returns a null-terminated C string to the last exception found.
 export const char* Arbutils_C_GetLastException() { return ExceptionHandler::GetLastException(); }
 
-#if !WINDOWS
+#if !WINDOWS && SIGNAL_HANDLING
 static ArbUt::SignalHandling sh;
 /// @brief Sets a callback to a function to run when a signal occurs.
 export void Arbutils_C_SetSignalCallback(void (*callback)(const char*)) { sh.SetCallback(callback); }