build: Added GameObject base to tictactoe sample

* Gets used in gifs and video

bin/app/user/projects/tictactoe/src/field.h

@@ -1,7 +1,9 @@
 #ifndef _FIELD_
 #define _FIELD_
 
-class Field {
+#include "game_object.h"
+
+class Field : public GameObject {
 public:
 	enum Token {
 		None = 0,

bin/app/user/projects/tictactoe/src/game_object.h

@@ -0,0 +1,10 @@
+#ifndef _GAME_OBJECT_
+#define _GAME_OBJECT_
+
+class GameObject {
+public:
+	GameObject() {}
+	virtual ~GameObject() {}
+};
+
+#endif // _GAME_OBJECT_

bin/app/user/projects/tictactoe/src/player.h

@@ -2,8 +2,9 @@
 #define _PLAYER_
 
 #include "field.h"
+#include "game_object.h"
 
-class Player {
+class Player : public GameObject {
 public:
 	Player( Field::Token token, const char* name );
 	virtual ~Player();