Pass options to Engine; add Engine::run()

src/fart/Engine.cpp

@@ -1,5 +1,11 @@
 #include <fart/Engine.h>
 
-Engine::Engine()
+Engine::Engine(const Options & options)
+    : options(options)
 {
 }
+
+int Engine::run()
+{
+    return 0;
+}