Add custom content and backports for V1 to V3

system/quests/shops/q254.json

@@ -0,0 +1,4 @@
+{
+  "AvailableIf": "!V_V1Present",
+  "Joinable": true
+}

system/quests/shops/q488-xb-e.bin

@@ -0,0 +1 @@
+q488-gc-e.bin

system/quests/shops/q488-xb.dat

@@ -0,0 +1 @@
+q488-gc.dat

system/quests/shops/q488.json

@@ -0,0 +1,3 @@
+{
+  "Joinable": true,
+}