🚧 [WIP] FMOD web support (HTML5)

[bitbrain]

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Closes #50

This PR aims to add support for web support via wasm.

Todo

• update SConstruct to consider web as a platform
• make scons platform=web pass & build libGodotFmod.web.template_debug.wasm32.wasm correctly
• Update documentation for how to build for web (requires Emscripten)
• Update Github Action to build for web
• Solve issue around bank file scanning (specifically file callback logic https://github.com/utopia-rise/fmod-gdextension/blob/master/src/callback/file_callbacks.cpp)

Known issues

• on Firefox, the GDExtension just hangs and crashes the browser. This is a known bug with wasm: fales.itch.io - The game is stuck in a loading state webcompat/web-bugs#127798

[bitbrain]

This builds fine and GDExtension seems to load in Chrome (Firefox still does not work), but then it fails due to memory issues in the browser:

[2shady4u]

Firefix also doesnt work for my SQLite plugin so I assume the issue with Firefox not working is on the side of godot-cpp itself.