add $battle command for dcv1

src/Client.hh

@@ -35,7 +35,7 @@ public:
     // TODO: It'd be nice to use a pattern here (e.g. all server-side flags are
     // in the high bits) but that would require re-recording or manually
     // rewriting all the tests
-    CLIENT_SIDE_MASK                           = 0xFF3CFFFF7C0BFFFB,
+    CLIENT_SIDE_MASK                           = 0xF73CFFFF7C0BFFFB,
 
     // Version-related flags
     CHECKED_FOR_DC_V1_PROTOTYPE                = 0x0000000000000002,
@@ -80,6 +80,7 @@ public:
     DEBUG_ENABLED                              = 0x0000000800000000,
     ITEM_DROP_NOTIFICATIONS_1                  = 0x0010000000000000,
     ITEM_DROP_NOTIFICATIONS_2                  = 0x0020000000000000,
+    FORCE_BATTLE_MODE_GAME                     = 0x0800000000000000,
 
     // Proxy option flags
     PROXY_SAVE_FILES                           = 0x0000001000000000,