Refactor project structure and remove unnecessary files

- Deleted generated CMake files and build artifacts from the cmake-build-debug directory.
- Removed the Intellisense header - what was that???
- Cleaned up the melonDS.ini configuration (removed hard path)

.vscode/settings.json

@@ -1,5 +1,9 @@
 {
     "files.associations": {
         "array": "cpp"
-    }
+    },
+    "clangd.arguments": [
+        "--query-driver=${env:DEVKITPRO}/devkitARM/bin/arm-none-eabi-*",
+        "--compile-commands-dir=."
+    ]
 }