Context.pushExceptionHandler

Push an exception handler in context. Whenever a JavaScript exception happens in the #JSCContext, the given handler will be called. The default #JSCExceptionHandler simply calls [javascriptcore.context.Context.throwException] to throw the exception to the #JSCContext. If you don't want to catch the exception, but only get notified about it, call [javascriptcore.context.Context.throwException] in handler like the default one does. The last exception handler pushed is the only one used by the #JSCContext, use [javascriptcore.context.Context.popExceptionHandler] to remove it and set the previous one. When handler is removed from the context, destroy_notify i called with user_data as parameter.