Adds the ability to load raw text files.

[timbl]

See
https://webpack.js.org/loaders/raw-loader/
and also special typings for tsc in eg solid-ui and solid-panes

We can now just importing text files like TTL files directly, instead of having to make them in JS wrapper files.

[angelo-v]

You need to commit an updated package-lock.json as well and I think also the raw-loader has to be configured in webpack config, otherwise it will not be used