Running C# code using wasm

First try with the regex editor: allow checking the regex from C# instead of javascript code. (see here).

Creation of a .NET 7 library to contain the C# code
Installation of workload
```
dotnet workload install wasm-tools
```

Publishing project

dotnet publish dotnet/Dotnet.Tools.Wasm/Dotnet.Tools.Wasm.csproj --configuration Release
rm -rf src/assets/dotnet
mkdir -p src/assets/dotnet/dotnet-tools
cp -r dotnet/Dotnet.Tools.Wasm/bin/Release/net7.0/browser-wasm/AppBundle/* src/assets/dotnet/dotnet-tools

Update src/index.html

<script type="module" src="./assets/dotnet/dotnet-tools/dotnet.tools.js"></script>