Make it possible to host BlueMap on static web hosts with client decompression mode

[fechan]

What it does

This PR is intended to address #293 by allowing you to host the web directory generated by BlueMap on a static web host, such as Github Pages. This is achieved by modifying web/settings.json and adding "clientDecompression": true.

A Github Pages demo is currently available from the following links (though I may move it soon):

• Demo: https://fredchan.org/shack-village-maps
• GH repo: https://github.com/fechan/shack-village-maps

Implementation details

There are two places that request files that are stored gzipped at rest: textures.json and PRBMs. When clientDecompression is on, it will attempt to fetch <filename>.gz instead of the normal filename, using RevalidatingFileLoader. After settingRevalidatingFileLoader.setClientDecompression(true), the file loader will decompress the gzipped data using the browser-native Compression Streams API.

Possible issues

• Client decompression will not work in the Vite preview environment (i.e. when you use npm run dev), since the decompression code errors out with Failed to read data from the ReadableStream: “TypeError: The input data is corrupted: incorrect header check”. This seems to be the same issue faced by these folks: Can't download mp3 when self-hosting via Docker monochrome-music/monochrome#320. However, this does not affect the production environment.

[TBlueF]

I am currently in the process of rewriting the webapp, this feature is already implemented there.
But until that rewrite is done, i think it doesn't do any harm to merge this :)