MSCO 2.9.0: standalone without MSCLoader (Unity Doorstop)

- Bootstrap: Doorstop entry point, loads Harmony/Newtonsoft from the MSCO folder, hooks
  PlayMakerArrayListProxy.Awake and starts MSCO in the main menu; skips the news screen
- No MSCLoader reference anymore; key bindings in PlayerPrefs, bind console command
- Harmony 1.2 and Newtonsoft.Json in lib/ (MIT notices); build copies to <game>\MSCO
- README/CHANGELOG updated

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/THIRD-PARTY.txt

@@ -0,0 +1,20 @@
+Third-party libraries shipped with MSCO
+=======================================
+
+0Harmony.dll - Harmony 1.2.0.1 by Andreas Pardeike
+  https://github.com/pardeike/Harmony - MIT License
+  Copyright (c) 2017 Andreas Pardeike
+
+Newtonsoft.Json.dll - Json.NET 13.0.4 by James Newton-King
+  https://www.newtonsoft.com/json - MIT License
+  Copyright (c) 2007 James Newton-King
+
+MIT License: Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+associated documentation files (the "Software"), to deal in the Software without restriction, including without
+limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above
+copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.