Add Opera (3DO) and Muppen64plus_next (N64) files

[dosboxonline]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Add files [mupen64plus_next_libretro.js, mupen64plus_next_libretro.wasm, opera_libretro.js, opera_libretro.wasm] to the data directory from this repository - BinBashBanana/webretro. Tested it and it works well. You can also add these files - parallel_n64_libretro.js, parallel_n64_libretro.wasm otherwise it doesn't work well game Residen Evil 64.

Reason for change

Replace EmulatorJS (ethanaobrien) cores with Libretro cores.

Proposed code change

In 3do.json file - "emulator": "libretro-opera"
in n64.json file - "emulator": "libretro-mupen64plus_next"

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[thelamer]

I could not get opera to work well but built out and include by default the mupen core now.

[dosboxonline]

In my case, opera core it only worked with zip files with ISO inside. CHD are supported in a newer opera core version.

[thelamer]

Still working on opera I need chd support it is must for most browsers especially mobile to keep the footprint under 1 gig. This will probably be a while.