Improve the skin fix code

- Spoof 404 instead of keeping original URL.
- Move JsonParseException to the package.
- Pass proxy as null to reduce code duplication.

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

libraries/launcher/CMakeLists.txt

@@ -23,7 +23,8 @@ set(SRC
     org/prismlauncher/utils/JsonParser.java
     org/prismlauncher/utils/Parameters.java
     org/prismlauncher/utils/ReflectionUtils.java
-    org/prismlauncher/utils/UrlUtils.java
+    org/prismlauncher/utils/url/NullConnection.java
+    org/prismlauncher/utils/url/UrlUtils.java
     org/prismlauncher/utils/logging/Level.java
     org/prismlauncher/utils/logging/Log.java
     net/minecraft/Launcher.java