If the C# extension is installed, then it reports 25k+ errors on the C# extractor until it is properly built. This is pure noise because the solution would be opened and built from the correct subdirectory. This commit disables the C# compilation altogether.
I've added a `.vscode/extensions.json` file that will automatically recommend the CodeQL for Visual Studio Code extension to anyone who opens the repo in VS Code (without the extension already installed).
If you're developing one of the libraries that has muiltiple copies auto-generated by `sync-files.py`, you can now run `sync-files.py --latest` by going to the `Terminal | Run Task...` menu in VS Code and selecting the `Sync Identical Files` task. You can set a keyboard binding to run this task for quicker access.
