Upgrade xmllint to wasm for more efficienty in XML Validation

We have found out that wasm (webassembley) is machine code for browsers. This means that we can use it for higher performance in using xmllint from C-Code. Native code can be used in Electron too, but it isn't recommended because of the incompatibility with different system architectures and operating systems.

I have found following project: https://github.com/noppa/xmllint-wasm/ Unfortunally it uses webloaders. Webloaders are supported with Webpack 5. So the project needs an update to Nuxt3 and webpack 5 first (see #160).