glsl modules now just work by simple copy of the source code, which enables to ditch struct uniforms, which will be necessary for WebGPU

See https://forum.babylonjs.com/t/texture-sampler-and-non-uniform-control-flow/46084/2 for discussion and solution.

TLDR: advanced shaders need non uniform control flow for textures samplers and added a comment at the top of the glsl disable the checks

Setting each element by string made WebGPU crash. By using the setFloatArray method, we can achieve the expected behavior without crashing WebGPU

Shader code will be added to the store only when an object requiring it is created.

This will ease the debug process and makes the code cleaner.

To understand, refer to this discussion: https://forum.babylonjs.com/t/webgl-warning-when-binding-procedural-texture-to-postprocess/46047

On chromium browsers, in some rare cases, the procedural textures would be binded before they were rendered, causing undefined behavior.

Creating them before updating the positions would create associated procedural textures. They render the scene to init themselves, so we don't want the update code  to run before the bodies are well positioned