Add munit for unit testing.

Main method extracted to separate file to make it easier to test the _rest_ of the code.
munit is added as a submodule by running `cd src; git submodule add https://github.com/nemequ/munit.git` .

Unit testing has so far only been tested on ubuntu.

src/test/testrunner.h

@@ -0,0 +1,26 @@
+#ifndef TESTRUNNER_H
+#define TESTRUNNER_H
+
+#include "../conf.h"
+#include "../sysdep.h"
+#include "../structs.h"
+#include "../utils.h"
+#include "../comm.h"
+#include "../db.h"
+#include "../handler.h"
+#include "../screen.h"
+#include "../interpreter.h"
+#include "../spells.h"
+#include "../dg_scripts.h"
+#include "../act.h"
+#include "../class.h"
+#include "../fight.h"
+#include "../quest.h"
+#include "../mud_event.h"
+#include "../munit/munit.h"
+
+
+#define UNIT_TEST(test_name) MunitResult (test_name)(const MunitParameter params[], void* data) 
+
+
+#endif