Enable menu (X,O,T is ESCAPE, log is RETURN)

This is temporary, the keymap will likely be changed later.

README

@@ -13,7 +13,6 @@ TODO:
 -> Some bad textures here and there
 -> Supply more VRAM memory to internal allocator
 -> Level selector
--> Difficulty selector
 -> Rate-limit the game when overclocking
 -> Run key?
 -> FPS counter on-screen

cgdoom/i_system.c

@@ -309,6 +309,8 @@ int KeycodeToDoomKey(int code)
     case KEYCODE_OPTN:      return KEY_PAUSE;
     case KEYCODE_0:         return KEY_SLEFTARROW;
     case KEYCODE_DOT:       return KEY_SRIGHTARROW;
+    case KEYCODE_XOT:       return KEY_ESCAPE;
+    case KEYCODE_LOG:       return KEY_ENTER;
     default:                return -1;
     }
 }