Library dxt-js as optional dependency

[Timic3]

RW parser as a whole has quite large bundle size, considering 87% of the size comes from dxt-js library. We could implement DXT decompression (we don't need compression) functionality in JavaScript/TypeScript and ship significantly smaller bundle size with no dependencies whatsoever. It might be a bit slower, but if people want to trade speed for smaller bundle size, this should be an option.

[AnriTool]

Hi, I am preparing a solution to get away from dxt-js.
Along with moving away from dxt-js, I have added different formats and support for VC, III

I created txd for vc, sa, iii, added images of different formats to them and then displayed them on canvas in the browser.

The code turned out ugly at the moment, so I'll try to tidy it up and post a PR soon

result screen

[Timic3]

Hey, @AnriTool that's perfect! Would definitely appreciate the PR when you're ready :)