Add solution file and update VSCode default

Add FueraDeEscala.slnx referencing Assembly-CSharp and Assembly-CSharp-Editor projects. Update .vscode/settings.json to point dotnet.defaultSolution to the new FueraDeEscala.slnx (and keep YAML file associations/file nesting). Update ProjectSettings/ProjectSettings.asset LFS oid (project settings metadata changed).

.vscode/settings.json

@@ -60,12 +60,12 @@
         "*.asset": "yaml",
         "*.meta": "yaml",
         "*.prefab": "yaml",
-        "*.unity": "yaml",
+        "*.unity": "yaml"
     },
     "explorer.fileNesting.enabled": true,
     "explorer.fileNesting.patterns": {
         "*.sln": "*.csproj",
         "*.slnx": "*.csproj"
     },
-    "dotnet.defaultSolution": "FueraDeEscala-DinaLabs.slnx"
+    "dotnet.defaultSolution": "FueraDeEscala.slnx"
 }