Clean up third-party material and add attributions

Remove the third-party cape tool, add the Mojang disclaimer, credits and
NOTICES entries (Apache-2.0 GifDecoder, Inter OFL), and bundle license
texts into the jar.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

README.MD

@@ -71,6 +71,9 @@ Most features belong in `common`, which every Minecraft version shares. For code
 
 - **Cloak Rendering:** `IIpho3nix` & Saturn
 - **Who Am I:** `FokshaWasTaken`
+- **Emotes:** modified versions of community [Emotecraft](https://emotecraft.org) emotes, credited to their authors
+- **Black hole cloaks:** variations of NASA imagery from Wikimedia Commons
+- **Cape creation tool:** [ko-fi.com/s/ce84afe094](https://ko-fi.com/s/ce84afe094)
 - **Panorama:**
   https://www.planetminecraft.com/texture-pack/minecraft-cavesand-cliffs-part-ii-main-menu-panorama/
 
@@ -83,6 +86,8 @@ Copyright © Saturn Client team. All rights reserved.
 
 The source code is publicly available to read, and contributions are welcome: you are free to fork the repository and open issues and pull requests to contribute. Beyond that, this software may not be copied, modified, or redistributed without explicit written permission from the copyright holders. By submitting a contribution, you agree that it becomes part of Saturn Client under these same terms. Third-party components keep their own licenses; see [NOTICES.md](NOTICES.md).
 
+**Saturn Client is not an official Minecraft product. It is not approved by or associated with Mojang or Microsoft.**
+
 <p align="center">
   Made with ❤️ by the Saturn Client team
 </p>