moved shade into a seperate file

src/shade.h

@@ -0,0 +1,15 @@
+#ifndef __SHADE_H__
+#define __SHADE_H__
+
+#include "characters.h"
+
+class shade final: public character {
+public:
+        shade(const position_list &available_positions); // spawn at a random place
+        virtual result attack(const direction dir,
+                              character_list &chlist) override;
+        virtual result get_hit(const enum race &race, const int atk,
+                               const float hit_rate) override;
+};
+
+#endif