Upgrade raw loader

[kirjs]

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What the issue is about

Starting with v2 (or v3) webpack raw loader is using es imports, which results in a change of behavior.

Before: require('!!raw-loader!1.txt') returned a string

Now: require('!!raw-loader!1.txt') returns a module with a default property which contains the text

We should investigate what would be the best way to upgrade the module

Where to start

• Search for raw-loader! across the codebase to find all the usages
• Upgrade raw-loader in package.json to