Vanilla/Turtle WoW support: M2 loading, bone parsing, textures, auth

- Vanilla M2 bone struct (108 bytes) with 28-byte animation tracks
- Version-aware bone parsing (vanilla vs WotLK format detection)
- Fix CharSections.dbc field layout for vanilla (variation/color at 4-5)
- Remove broken CharSections.csv files (all fields marked as strings)
- Expansion data reload on profile switch (DBC cache clear, layout reload)
- Vanilla packet encryption (VanillaCrypt XOR-based header crypt)
- Extended character preview geoset range (0-99) for vanilla models
- DBC cache clear support in AssetManager

Data/expansions/turtle/expansion.json

@@ -2,9 +2,11 @@
   "id": "turtle",
   "name": "Turtle WoW",
   "shortName": "Turtle",
-  "version": { "major": 1, "minor": 12, "patch": 1 },
-  "build": 5875,
+  "version": { "major": 1, "minor": 18, "patch": 0 },
+  "build": 7234,
+  "worldBuild": 5875,
   "protocolVersion": 3,
+  "os": "OSX",
   "locale": "enGB",
   "maxLevel": 60,
   "races": [1, 2, 3, 4, 5, 6, 7, 8],