Add Wasm support

[janhohenheim]

• Requires patched image: HDRs cannot be loaded in WASM bevyengine/bevy#7588 actually, HDRis are of limited use in WASM anyway, see How do I set a sample to non-filtering? bevyengine/bevy#7592. Using 16 bit precision instead.
• Fix shaders
  • repeated
  • glowy
• Fix controls
• Physics are moon-like
  Extra stuff:
• Suuuper slow on Firefox. Look into it by profiling Bevy, Add a trace feature. Might just drop Firefox support.
  • Don't know what fixed this, but Chrome and FF are both equally laggy now. That is: crap, but playable.
• Sometimes, one needs to open the game twice for it to work. The first time kinda crashes.
  • Not Wasm specific: The game sometimes gets stuck loading scene assets #129

[janhohenheim]

Update: it seems I had to remove 32 bit precision HDRis by converting them to regular 16 bit precision textures.
See bevyengine/bevy#7592

[janhohenheim]

Per https://gpuweb.github.io/gpuweb/#texture-format-caps, 32-bit does not support filtering at all. I could use 32 bit on native and 16 bit on wasm, but meeeeh.