- Rework geometry in depth, allow geometry and buffer passing in every avnd objects, add support for instancing.

- Add a raw raster pipeline object which allows to render using entirely custom shader, with only a small veneer of isf.
e.g. this allows to define what are the vertex inputs / outputs.
This also allow instanced rendering.

- Add many geometry utilities:
* Geometry Info to get basic info about an input geometry
* Extract attribute / buffer / etc.
* Create a mesh from multiple buffers
* Pointcloud to mesh
* Repack attributes to pack or multiple attributes of a geometry into a single buffer.

…ing guarantees

…tion

…ilding their geometry yet

… and buf2array

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