[Enhance][Bug fix] Another bundle mode & skill_amane bug

- For Arcaea 5.6.0
- Fix a bug that `skill_amane` may arise error when the step type of world map is null.
- Add a new bundle update mode, which is same with official server, that the server will find a update path from old version to new version, ignoring the application version restrictions.

latest version/database/init/singles.json

@@ -1720,5 +1720,59 @@
 		],
 		"orig_price": 100,
 		"price": 100
+	},
+	{
+		"name": "distortedfate",
+		"items": [
+			{
+				"type": "single",
+				"id": "distortedfate",
+				"is_available": true
+			},
+			{
+				"type": "core",
+				"amount": 1,
+				"id": "core_generic",
+				"is_available": true
+			}
+		],
+		"orig_price": 100,
+		"price": 100
+	},
+	{
+		"name": "floatingworld",
+		"items": [
+			{
+				"type": "single",
+				"id": "floatingworld",
+				"is_available": true
+			},
+			{
+				"type": "core",
+				"amount": 1,
+				"id": "core_generic",
+				"is_available": true
+			}
+		],
+		"orig_price": 100,
+		"price": 100
+	},
+	{
+		"name": "chromafill",
+		"items": [
+			{
+				"type": "single",
+				"id": "chromafill",
+				"is_available": true
+			},
+			{
+				"type": "core",
+				"amount": 1,
+				"id": "core_generic",
+				"is_available": true
+			}
+		],
+		"orig_price": 100,
+		"price": 100
 	}
 ]