Add basic structure for fuzzing targets

General changes:

* Add -D/--deterministic command line option as
  convenience/alternative to -G/--load-seeds (i.e. no file needed, it just
  uses zero-initialized random seeds).  It also changes Broker data
  stores over to using deterministic timing rather than real time.

* Add option to make Reporter abort on runtime scripting errors

src/zeek-setup.h

@@ -0,0 +1,31 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+#pragma once
+
+#include "Options.h"
+
+namespace zeek {
+
+struct SetupResult {
+	int code = 0;
+	zeek::Options options;
+};
+
+/**
+ * Initializes Zeek's global state.
+ * @param argc  the argument count (same semantics as main function)
+ * @param argv  the argument strings (same semantics as main function)
+ * @param options  if provided, those options are used instead of
+ * deriving them by parsing the "argv" list.  The "argv" list still
+ * needs to be provided regardless since some functionality requires
+ * it, particularly, several things use the value of argv[0].
+ */
+SetupResult setup(int argc, char** argv, zeek::Options* options = nullptr);
+
+/**
+ * Cleans up Zeek's global state.
+ * @param did_net_run  whether the net_run() was called.
+ */
+int cleanup(bool did_net_run);
+
+}