renamed display to output

src/map.h

@@ -4,7 +4,7 @@
 #include <string>
 #include <utility>
 
-#include "display.h"
+#include "output.h"
 #include "position.h"
 #include "rng.h"
 #include "fraction.h"
@@ -64,7 +64,7 @@ public:
         position_list get_room_list(int idx) const;
         std::vector<position_list> get_room_list() const;
         // IMPORTANT: always print a map before anything else
-        void print(display *out) const;
+        void print(output *out) const;
 
         position get_up_stairs() const;
         position get_down_stairs() const;