Remove md5 and use xxHash128 for hashing algorithm in debug infos

[Paulo-21]

#294
Hello, i have choosen xxHash128 which is a non cryptographical hashing function and stay with the lenght of 128 bits to match the previous output with md5.
You can view the difference in term of performance bellow
Before :
https://rapier.rs/demos3d/index.html
https://rapier.rs/demos2d/index.html
After :
https://pi-univers.fr/rapier.js/testbed3d/dist/
https://pi-univers.fr/rapier.js/testbed2d/dist/

[Vrixyz]

Thanks, That's great!

I'll give @sebcrozet a chance to review before merging as it touches dependencies and there might be details I'm unaware of.

On a side note, the example pyramid seems to perform worse on your build than on the official one (on my iphone ~28ms vs ~20ms frames), I imagine that's a difference in build settings, but it's an interesting and surprising difference, which may be worth understanding why.

[Vrixyz]

I realize on the website, md5 is advertised, so we might want to update that too for consistency.

But consider this outside of the scope of this PR, as that's outside of this repository and needs decision validation.

[sebcrozet]

Looks good, thanks! Why did the package.json of rapier need to be modified, considering that PR code changes are about the testbed only?

@Vrixyz I'm actually seeing the opposite: their build is slightly faster (on Android though). I think the main factor is that the official demos are still on rapier 0.12 whereas the new build is on 0.14.

[Vrixyz]

Thanks!

[Paulo-21]

Hello, does it will be backported to the website demo ?

[Vrixyz]

Hello, does it will be backported to the website demo ?

Eventually, yes 👍 , but there's no strict schedule on doing so.