[Feature Request]web version /javascript method

[nenge123]

The sound effect simulated by this warehouse is much better than that of "retroarch-mgba/vbanet"!

so when you can set option.ini folder

When building, compress "wasm/js" into a zip file.

In this way, I only need to introduce a "hack.js" file to "index.html" to achieve a better way to "load/store".

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But I need some js methods.

• Importing srm/state when i running game,not need filename same as game filename.

• output Canvas in the current state picture Uint8array. using For online translation